This page lists 256 engine parts for the 1978 Checker Marathon, across 42 part types, covering all 3 engine options (4.1L 250cid L6, 5.0L 305cid V8 and 5.7L 350cid V8). Every part shows its brand, manufacturer part number and fitment notes.
The engine on the 1978 Checker Marathon covers the internals and hard parts that build compression and keep oil where it belongs — gaskets, bearings, camshafts, lifters, seals and timing components. The largest groups are Connecting Rod Bearing (39 parts), Crankshaft Main Bearing (19 parts) and Valve Cover Gasket (16 parts). The other 39 part types cover the remaining 182 parts.
The 1978 Checker Marathon was sold with 3 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
34 brands supply engine parts for the 1978 Checker Marathon, led by MAHLE / CLEVITE (62 parts), ARP (32 parts) and FEL-PRO (26 parts), plus 31 more brands. Quality grades include Standard Replacement, High Performance and Economy.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 1978 Checker Marathon. 44 parts have it, including DURA-BOND CH8 (Camshaft Bearing) and KING ENGINE BEARINGS CR807SI (Connecting Rod Bearing). Each part number opens a page with every vehicle that part fits.
Bolt Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ARP Fits: 5.0L 305cid V8 | 5349701 | 🇺🇸 US 🇨🇦 CA | Black Oxide12 Point Bolt Head | View on Amazon |
| ARP Fits: 5.0L 305cid V8 | 5349801 | 🇺🇸 US 🇨🇦 CA | Hex Bolt Head | View on Amazon |
| ARP Fits: 5.0L 305cid V8 | 5349601 | 🇺🇸 US 🇨🇦 CA | Stainless Steel Hex Bolt Head | View on Amazon |
| ARP Fits: 5.0L 305cid V8 | 5349501 | 🇺🇸 US 🇨🇦 CA | Stainless Steel12 Point Bolt Head | View on Amazon |
This table covers the Bolt kits.
ARP supplies the 4 Bolt Kit parts for the 1978 Checker Marathon.
Listed part numbers: ARP 5349701, ARP 5349801 and ARP 5349601, plus the other parts above.
Camshaft Bearing
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DURA-BOND Popular Fits: 5.0L 305cid V8 | CH8 | 🇺🇸 US 🇨🇦 CA | Standard | View on Amazon |
| SEALED POWER Popular Fits: 5.0L 305cid V8 | 1235M | 🇺🇸 US 🇨🇦 CA | Babbitt StyleFull Round Design | View on Amazon |
| DURA-BOND Fits: 5.0L 305cid V8 | CHP8 | 🇺🇸 US 🇨🇦 CA | High Performance | View on Amazon |
| DURA-BOND Fits: 5.0L 305cid V8 | CHP8T | 🇺🇸 US 🇨🇦 CA | High PerformanceCoated | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | SH290S | 🇺🇸 US 🇨🇦 CA | Full Set | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | SH1349S | 🇺🇸 US 🇨🇦 CA | High PerformanceFull Set | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | SH1796S | 🇺🇸 US 🇨🇦 CA | Full Set | View on Amazon |
| SEALED POWER Fits: 5.0L 305cid V8 | 1750M | 🇺🇸 US 🇨🇦 CA | Babbitt Style2.030 IN Maximum Housing Bore | View on Amazon |
| SEALED POWER Fits: 5.0L 305cid V8 | 1749M | 🇺🇸 US 🇨🇦 CA | AluminumBi-Metal | View on Amazon |
This table covers the Camshaft bearings. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly.
9 Camshaft Bearing parts are listed for the 1978 Checker Marathon, from DURA-BOND, SEALED POWER and MAHLE / CLEVITE. DURA-BOND CH8 carries the "Popular" badge.
Listed part numbers: DURA-BOND CH8, SEALED POWER 1235M and DURA-BOND CHP8, plus the other parts above.
Camshaft Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ARP Fits: 5.0L 305cid V8 | 1341001 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Camshaft bolts.
This group shows a single part: ARP 1341001.
Connecting Rod Bearing
High Performance
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ENGINE PRO Fits: 5.0L 305cid V8 | 11663H | 🇺🇸 US 🇨🇦 CA | Performance H SeriesSet | View on Amazon |
| ENGINE PRO Fits: 5.0L 305cid V8 | 11663HX | 🇺🇸 US 🇨🇦 CA | High PerformanceExtra Oil Clearance of .001 | View on Amazon |
| ENGINE PRO Fits: 5.0L 305cid V8 | 11663HD | 🇺🇸 US 🇨🇦 CA | High Performancewith dowel hole | View on Amazon |
| ENGINE PRO Fits: 5.0L 305cid V8 | 11663HC | 🇺🇸 US 🇨🇦 CA | High PerformanceCoated | View on Amazon |
| ENGINE PRO Fits: 5.0L 305cid V8 | 11663HXC | 🇺🇸 US 🇨🇦 CA | High PerformanceCoated | View on Amazon |
| KING ENGINE BEARINGS Fits: 5.0L 305cid V8 | CR807HPND | 🇺🇸 US 🇨🇦 CA | SetRace bearings, Bimetal (Alecular) | View on Amazon |
| KING ENGINE BEARINGS Fits: 5.0L 305cid V8 | CR807HPNDX | 🇺🇸 US 🇨🇦 CA | SetRace bearings, Bimetal (Alecular) | View on Amazon |
| KING ENGINE BEARINGS Fits: 5.0L 305cid V8 | CR807XPN | 🇺🇸 US 🇨🇦 CA | SetRace bearings, Trimetal [Pmax Black] | View on Amazon |
| KING ENGINE BEARINGS Fits: 5.0L 305cid V8 | CR807XPNX | 🇺🇸 US 🇨🇦 CA | Race bearings, Trimetal [Pmax Black]Set | View on Amazon |
| KING ENGINE BEARINGS Fits: 5.0L 305cid V8 | CR807XPND | 🇺🇸 US 🇨🇦 CA | Race bearings, Trimetal [Pmax Black]Set | View on Amazon |
| KING ENGINE BEARINGS Fits: 5.0L 305cid V8 | CR807XPNDX | 🇺🇸 US 🇨🇦 CA | Race bearings, Trimetal [Pmax Black]Set | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | CB663HN | 🇺🇸 US 🇨🇦 CA | High PerformanceH Series (Tri-Metal) | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | CB663HND | 🇺🇸 US 🇨🇦 CA | High PerformanceH Series (Tri-Metal) | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | CB663FN | 🇺🇸 US 🇨🇦 CA | High PerformancePair | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | CB663VN | 🇺🇸 US 🇨🇦 CA | High PerformanceNarrowed | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | CB663VXN | 🇺🇸 US 🇨🇦 CA | High Performance.001in Extra Oil Clearance / Narrowed | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | CB663FND | 🇺🇸 US 🇨🇦 CA | High PerformancePair | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | CB663FXN | 🇺🇸 US 🇨🇦 CA | High PerformancePair | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | CB663FXND | 🇺🇸 US 🇨🇦 CA | High PerformancePair | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | CB663HXN | 🇺🇸 US 🇨🇦 CA | High Performance.001in Extra Oil Clearance / Narrowed | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | CB663HXND | 🇺🇸 US 🇨🇦 CA | High Performance.001 in Extra Oil Clearance / Narrowed / Doweled Connecting Rod | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | CB663HNC | 🇺🇸 US 🇨🇦 CA | High PerformanceH Series (Tri-Metal) | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | CB663HXNC | 🇺🇸 US 🇨🇦 CA | High Performance.001in Extra Oil Clearance / Narrowed / Coated | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | CB663HNDC | 🇺🇸 US 🇨🇦 CA | High PerformanceH Series (Tri-Metal) | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| KING ENGINE BEARINGS Popular Fits: 5.0L 305cid V8 | CR807SI | 🇺🇸 US 🇨🇦 CA | SetBimetal (Aluminum Silicon Base) | View on Amazon |
| MAHLE / CLEVITE Popular Fits: 5.0L 305cid V8 | CB663A | 🇺🇸 US 🇨🇦 CA | A Series (Aluminum)Pair | View on Amazon |
| MAHLE / CLEVITE Popular Fits: 5.0L 305cid V8 | CB663P | 🇺🇸 US 🇨🇦 CA | P Series (Tri-Metal)Pair | View on Amazon |
| MAHLE / CLEVITE Popular Fits: 5.0L 305cid V8 | CB663A8 | 🇺🇸 US 🇨🇦 CA | A Series (Aluminum)Set | View on Amazon |
| MAHLE / CLEVITE Popular Fits: 5.0L 305cid V8 | CB663P8 | 🇺🇸 US 🇨🇦 CA | P Series (Tri-Metal)Set | View on Amazon |
| SEALED POWER Popular Fits: 5.0L 305cid V8 | 2555CP | 🇺🇸 US 🇨🇦 CA | Overplated Copper-Lead Alloy | View on Amazon |
| KING ENGINE BEARINGS Fits: 5.0L 305cid V8 | CR865SI | 🇺🇸 US 🇨🇦 CA | SetBimetal (Aluminum Silicon Base) | View on Amazon |
| KING ENGINE BEARINGS Fits: 5.0L 305cid V8 | CR807SIX | 🇺🇸 US 🇨🇦 CA | Setbimetal (aluminum silicon base) | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | CB1776A | 🇺🇸 US 🇨🇦 CA | A Series (Aluminum)Pair | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | CB1776A8 | 🇺🇸 US 🇨🇦 CA | A Series (Aluminum)Set | View on Amazon |
| SEALED POWER Fits: 5.0L 305cid V8 | 2555A | 🇺🇸 US 🇨🇦 CA | A-Series Aluminum BearingsStandard Shaft Minimum (Inch): 2.0990 In | View on Amazon |
| SEALED POWER Fits: 5.0L 305cid V8 | 82555A | 🇺🇸 US 🇨🇦 CA | SetA-Series aluminum bearings | View on Amazon |
| SEALED POWER Fits: 5.0L 305cid V8 | 82555CP | 🇺🇸 US 🇨🇦 CA | SetOverplated Copper-Lead Alloy | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| KING ENGINE BEARINGS Fits: 5.0L 305cid V8 | CR807HPNX | 🇺🇸 US 🇨🇦 CA | Race bearings, Bimetal (Alecular)Set | View on Amazon |
| KING ENGINE BEARINGS Fits: 5.0L 305cid V8 | CR807HPN | 🇺🇸 US 🇨🇦 CA | SetRace bearings, Bimetal (Alecular) | View on Amazon |
This table covers the bearings in the connecting-rod big ends. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly.
39 Connecting Rod Bearing parts are listed for the 1978 Checker Marathon, from MAHLE / CLEVITE, KING ENGINE BEARINGS, ENGINE PRO and 1 other brand. KING ENGINE BEARINGS CR807SI carries the "Popular" badge. Grades run from High Performance through Standard Replacement; High Performance is the most populated section, led by MAHLE / CLEVITE, KING ENGINE BEARINGS and ENGINE PRO.
Connecting Rod Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ARP Fits: 5.0L 305cid V8 | 1346003 | 🇺🇸 US 🇨🇦 CA | Large Journal 3/8" | View on Amazon |
| ARP Fits: 5.0L 305cid V8 | 1346001 | 🇺🇸 US 🇨🇦 CA | Small Journal 11/32" | View on Amazon |
This table covers the Connecting Rod bolts.
2 Connecting Rod Bolt parts for the 1978 Checker Marathon come from ARP.
This group includes ARP 1346003 and ARP 1346001.
Connecting Rod Nut
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 5.0L 305cid V8 | 635002 | 🇺🇸 US 🇨🇦 CA | Thread Size: 3/8-24Hex: 9/16" | View on Amazon |
This table covers the Connecting Rod nuts.
This group shows a single part: DORMAN 635002.
Conversion / Lower Gasket Set
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| APEX Popular Fits: 5.0L 305cid V8 | ACS3022 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| ENGINE PRO Fits: 5.0L 305cid V8 | 3777332 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| FEL-PRO Fits: 5.0L 305cid V8 | CS77332 | 🇺🇸 US 🇨🇦 CA | Multi-PieceRear Main Seal Not Included | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | CS1178 | 🇺🇸 US 🇨🇦 CA | Includes 2 Piece Rear Main Seal | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 081005601 | 🇺🇸 US 🇨🇦 CA | with 2 Piece Rear Main Seal | View on Amazon |
This table covers lower / conversion gasket sets for oil-pan and related joints. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration.
5 Conversion / Lower Gasket Set parts are listed for the 1978 Checker Marathon, from APEX, ENGINE PRO, FEL-PRO and 2 other brands. APEX ACS3022 carries the "Popular" badge.
This group includes APEX ACS3022, ENGINE PRO 3777332 and FEL-PRO CS77332 and the remaining parts above.
Crankshaft Main Bearing
High Performance
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MAHLE / CLEVITE Popular Fits: 5.0L 305cid V8 | MS909H | 🇺🇸 US 🇨🇦 CA | High PerformanceH Series (Tri-Metal) | View on Amazon |
| KING ENGINE BEARINGS Fits: 5.0L 305cid V8 | MB557HP | 🇺🇸 US 🇨🇦 CA | alecular (racing line)Set | View on Amazon |
| KING ENGINE BEARINGS Fits: 5.0L 305cid V8 | MB557HPX | 🇺🇸 US 🇨🇦 CA | alecular (racing line)Set | View on Amazon |
| KING ENGINE BEARINGS Fits: 5.0L 305cid V8 | MB557XPX | 🇺🇸 US 🇨🇦 CA | Race bearings, Trimetal [Pmax Black]Set | View on Amazon |
| KING ENGINE BEARINGS Fits: 5.0L 305cid V8 | MB557XP | 🇺🇸 US 🇨🇦 CA | SetRace bearings, Trimetal [Pmax Black] | View on Amazon |
| KING ENGINE BEARINGS Fits: 5.0L 305cid V8 | MB557XPC | 🇺🇸 US 🇨🇦 CA | pmaxkote (racing line), polymer coatedSet | View on Amazon |
| KING ENGINE BEARINGS Fits: 5.0L 305cid V8 | MB557XPCX | 🇺🇸 US 🇨🇦 CA | pmaxkote (racing line), polymer coatedSet | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | MS909HX | 🇺🇸 US 🇨🇦 CA | High PerformanceH Series (Tri-Metal) | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | MS909HC | 🇺🇸 US 🇨🇦 CA | High PerformanceCoated | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MAHLE / CLEVITE Popular Fits: 5.0L 305cid V8 | MS909A | 🇺🇸 US 🇨🇦 CA | A Series (Aluminum)Set | View on Amazon |
| MAHLE / CLEVITE Popular Fits: 5.0L 305cid V8 | MS909P | 🇺🇸 US 🇨🇦 CA | P Series (Tri-Metal)Set | View on Amazon |
| SEALED POWER Popular Fits: 5.0L 305cid V8 | 4663M | 🇺🇸 US 🇨🇦 CA | SetOverplated Copper-Lead Alloy | View on Amazon |
| KING ENGINE BEARINGS Fits: 5.0L 305cid V8 | MB557SI | 🇺🇸 US 🇨🇦 CA | SetBimetal (Aluminum Silicon Base) | View on Amazon |
| SEALED POWER Fits: 5.0L 305cid V8 | 4663MA | 🇺🇸 US 🇨🇦 CA | SetA-Series aluminum bearings | View on Amazon |
| SEALED POWER Fits: 5.0L 305cid V8 | 6688M | 🇺🇸 US 🇨🇦 CA | SetOverplated Copper-Lead Alloy | View on Amazon |
| SEALED POWER Fits: 5.0L 305cid V8 | 7329MA | 🇺🇸 US 🇨🇦 CA | SetA-Series aluminum bearings | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ENGINE PRO Fits: 5.0L 305cid V8 | 12909H | 🇺🇸 US 🇨🇦 CA | OE Replacement A SeriesSet | View on Amazon |
| ENGINE PRO Fits: 5.0L 305cid V8 | 12909HX | 🇺🇸 US 🇨🇦 CA | Performance H Series +.001 Bearing OversizeSet | View on Amazon |
| ENGINE PRO Fits: 5.0L 305cid V8 | 12909HC | 🇺🇸 US 🇨🇦 CA | Performance H Series CoatedSet | View on Amazon |
This table covers the main bearings that support the crankshaft in the block. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly.
19 Crankshaft Main Bearing parts for the 1978 Checker Marathon come from 4 brands — KING ENGINE BEARINGS, MAHLE / CLEVITE, SEALED POWER and 1 other brand. The "Popular" part is MAHLE / CLEVITE MS909H.
The High Performance section lists 9 options from KING ENGINE BEARINGS and MAHLE / CLEVITE — engineered beyond original-equipment specification. MAHLE / CLEVITE MS909H is listed in this group.
In the Standard Replacement grade, SEALED POWER, MAHLE / CLEVITE and KING ENGINE BEARINGS supply 7 parts: built to original-equipment specification. A representative part number is MAHLE / CLEVITE MS909A.
3 further parts sit outside the graded sections, with the same engine-level match.
Crankshaft Main Bearing Cap Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ARP Fits: 5.0L 305cid V8 | 1345401 | 🇺🇸 US 🇨🇦 CA | Stud2-Bolt | View on Amazon |
| ARP Fits: 5.0L 305cid V8 | 1345601 | 🇺🇸 US 🇨🇦 CA | Stud4-Bolt | View on Amazon |
This table covers the Crankshaft Main Bearing Cap bolts.
ARP supplies both parts for the 1978 Checker Marathon.
Part numbers include ARP 1345401 and ARP 1345601.
Crankshaft Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NATIONAL Fits: 5.0L 305cid V8 | 99176 | 🇺🇸 US 🇨🇦 CA | Front0.563 IN Width | View on Amazon |
| TIMKEN Fits: 5.0L 305cid V8 | KWK99176 | 🇺🇸 US 🇨🇦 CA | Kwik-Sleeve | View on Amazon |
| WJB / INMOTION PARTS Fits: 5.0L 305cid V8 | WS99176 | 🇺🇸 US 🇨🇦 CA | Installation Depth: 0.81299999999999994 InShaft Diameter Minimum (In): 1.7609999999999999 In | View on Amazon |
This table covers the sleeves used to restore a grooved crankshaft seal surface.
3 Crankshaft Repair Sleeve parts for the 1978 Checker Marathon come from 3 brands — NATIONAL, TIMKEN and WJB / INMOTION PARTS.
This group includes NATIONAL 99176, TIMKEN KWK99176 and WJB / INMOTION PARTS WS99176.
Crankshaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO Popular Fits: 5.0L 305cid V8 | BS40013 | 🇺🇸 US 🇨🇦 CA | Rubber | View on Amazon |
| NATIONAL Popular Fits: 5.0L 305cid V8 | 9845 | 🇺🇸 US 🇨🇦 CA | Front0.375 IN Width | View on Amazon |
| TIMKEN Popular Fits: 5.0L 305cid V8 | 9845 | 🇺🇸 US 🇨🇦 CA | Front | View on Amazon |
| APEX Fits: 5.0L 305cid V8 | ABS322 | 🇺🇸 US 🇨🇦 CA | Rear | View on Amazon |
| BCA Fits: 5.0L 305cid V8 | NS9845 | 🇺🇸 US 🇨🇦 CA | Front0.375 IN Width | View on Amazon |
| FEL-PRO Fits: 5.0L 305cid V8 | BS118291 | 🇺🇸 US 🇨🇦 CA | Rubber | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | JV1627 | 🇺🇸 US 🇨🇦 CA | RubberSet | View on Amazon |
| NATIONAL Fits: 5.0L 305cid V8 | 5092 | 🇺🇸 US 🇨🇦 CA | RearSplit Type | View on Amazon |
| SCHAEFFLER Fits: 5.0L 305cid V8 | SS2784 | 🇺🇸 US 🇨🇦 CA | Front9.53 mm Width | View on Amazon |
| SCHAEFFLER Fits: 5.0L 305cid V8 | SR3932 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 191006901 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 191011601 | 🇺🇸 US 🇨🇦 CA | SetRubber | View on Amazon |
| WJB / INMOTION PARTS Fits: 5.0L 305cid V8 | WS5092 | 🇺🇸 US 🇨🇦 CA | Housing Bore: 3 InMaterial: Silicone | View on Amazon |
| WJB / INMOTION PARTS Fits: 5.0L 305cid V8 | WS9845 | 🇺🇸 US 🇨🇦 CA | Housing Bore: 2.4089999999999998 InInside Diameter: 1.7629999999999999 In | View on Amazon |
This table covers the front and rear seals that keep oil in at the crankshaft. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
14 Crankshaft Seal parts for the 1978 Checker Marathon come from 9 brands — FEL-PRO, NATIONAL, SCHAEFFLER and 6 other brands. The "Popular" part is FEL-PRO BS40013.
Cylinder Head Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ARP Popular Fits: 5.0L 305cid V8 | 1343601 | 🇺🇸 US 🇨🇦 CA | SetHex Bolt Head | View on Amazon |
| FEL-PRO Popular Fits: 5.0L 305cid V8 | ES72856 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
| APEX Fits: 5.0L 305cid V8 | AHB322 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
| ARP Fits: 5.0L 305cid V8 | 1343701 | 🇺🇸 US 🇨🇦 CA | SetBlack Oxide | View on Amazon |
| ARP Fits: 5.0L 305cid V8 | 1343703 | 🇺🇸 US 🇨🇦 CA | SetBlack Oxide Inner Rows, Stainless Steel Outer Row | View on Amazon |
| ARP Fits: 5.0L 305cid V8 | 1343603 | 🇺🇸 US 🇨🇦 CA | SetStainless Steel Hex Bolt Head | View on Amazon |
| ARP Fits: 5.0L 305cid V8 | 1344001 | 🇺🇸 US 🇨🇦 CA | Stud TypeHex Bolt Head | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | GS33285 | 🇺🇸 US 🇨🇦 CA | Cylinder Head Bolt KitSet | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 141004801 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
This table covers the bolts that clamp the cylinder head to the block.
9 Cylinder Head Bolt parts are listed for the 1978 Checker Marathon, from ARP, FEL-PRO, APEX and 2 other brands. ARP 1343601 carries the "Popular" badge.
This group includes ARP 1343601, FEL-PRO ES72856 and APEX AHB322 and the remaining parts above.
Cylinder Head Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| APEX Popular Fits: 5.0L 305cid V8 | AHG324 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| FEL-PRO Popular Fits: 5.0L 305cid V8 | 8510PT | 🇺🇸 US 🇨🇦 CA | Permatorque | View on Amazon |
| FEL-PRO Fits: 5.0L 305cid V8 | 505SD | 🇺🇸 US 🇨🇦 CA | Permatorque Severe Duty | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | 5745 | 🇺🇸 US 🇨🇦 CA | Single-Sided Graphite | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | 3514VC | 🇺🇸 US 🇨🇦 CA | Composite | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | 3514SG | 🇺🇸 US 🇨🇦 CA | Graphite | View on Amazon |
| ULTRA-POWER Fits: 5.0L 305cid V8 | 8510PT | 🇺🇸 US 🇨🇦 CA | Head Bolt Replacement RecommendedHead Bolts Not Included | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 611033600 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 611060800 | 🇺🇸 US 🇨🇦 CA | Severe Duty | View on Amazon |
This table covers the head gaskets that seal the block to the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
9 Cylinder Head Gasket parts are listed for the 1978 Checker Marathon, from MAHLE / CLEVITE, FEL-PRO, VICTOR REINZ and 2 other brands. APEX AHG324 carries the "Popular" badge.
Listed part numbers: APEX AHG324, FEL-PRO 8510PT and FEL-PRO 505SD, plus the other parts above.
Cylinder Head Gasket Set
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| APEX Popular Fits: 5.0L 305cid V8 | AHS3032 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| FEL-PRO Fits: 5.0L 305cid V8 | HS8510PT | 🇺🇸 US 🇨🇦 CA | 2-17/32 (In) Inside Diameter Exhaust Pipe Packing Not IncludedIncludes Valve Stem Seals | View on Amazon |
| FEL-PRO Fits: 5.0L 305cid V8 | HS8510PTVK | 🇺🇸 US 🇨🇦 CA | 2-17/32 (In) Inside Diameter Exhaust Pipe Packing Not IncludedIncludes Head Bolts, Valve Stem Seals | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | HS3514VJ | 🇺🇸 US 🇨🇦 CA | Includes Valve Stem Seals | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 021032701 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers multi-piece gasket sets for a cylinder-head job. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration.
5 Cylinder Head Gasket Set parts are listed for the 1978 Checker Marathon, from FEL-PRO, APEX, MAHLE / CLEVITE and 1 other brand. APEX AHS3032 carries the "Popular" badge.
Part numbers include APEX AHS3032, FEL-PRO HS8510PT and FEL-PRO HS8510PTVK, among others listed above.
Engine Block Heater
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| KAT'S HEATERS Fits: 5.0L 305cid V8 | 11610 | 🇺🇸 US 🇨🇦 CA | Freeze Plug Heater | View on Amazon |
This table covers the block heaters that warm the coolant or oil in cold weather.
This group shows a single part: KAT'S HEATERS 11610.
Engine Kit Gasket Set
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO Popular Fits: 5.0L 305cid V8 | FS8510PT | 🇺🇸 US 🇨🇦 CA | 2-17/32 (In) Inside Diameter Exhaust Pipe Packing Not IncludedOverhaul Set | View on Amazon |
| ENGINE PRO Fits: 5.0L 305cid V8 | 301023 | 🇺🇸 US 🇨🇦 CA | Head bolt replacement recommended | View on Amazon |
| ENGINE PRO Fits: 5.0L 305cid V8 | 311000 | 🇺🇸 US 🇨🇦 CA | FEL-Pro CO-Branded Performance Gasket Sets with Permatorque Steel Core Laminate Head Gaskets | View on Amazon |
| ENGINE PRO Fits: 5.0L 305cid V8 | 311000MLS | 🇺🇸 US 🇨🇦 CA | FEL-Pro CO-Branded Perfomance Gasket Sets with MLS Head Gaskets | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | 953045 | 🇺🇸 US 🇨🇦 CA | Full Gasket Set | View on Amazon |
This table covers full gasket kits covering the joints opened in an engine rebuild. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration.
5 Engine Kit Gasket Set parts are listed for the 1978 Checker Marathon, from ENGINE PRO, FEL-PRO and MAHLE / CLEVITE. FEL-PRO FS8510PT carries the "Popular" badge.
Listed part numbers: FEL-PRO FS8510PT, ENGINE PRO 301023 and ENGINE PRO 311000, plus the other parts above.
Harmonic Balancer Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ARP Fits: 5.0L 305cid V8 | 4306801 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| ARP Fits: 5.0L 305cid V8 | 1342501 | 🇺🇸 US 🇨🇦 CA | 5/8 Socket Head | View on Amazon |
| ARP Fits: 5.0L 305cid V8 | 2342501 | 🇺🇸 US 🇨🇦 CA | 13/16 Socket Head | View on Amazon |
This table covers the Harmonic Balancer bolts.
3 Harmonic Balancer Bolt parts for the 1978 Checker Marathon come from ARP.
This group includes ARP 4306801, ARP 1342501 and ARP 2342501.
Harmonic Balancer Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MAHLE / CLEVITE Popular Fits: 5.0L 305cid V8 | A228 | 🇺🇸 US 🇨🇦 CA | Nickel Plated Formed Steel | View on Amazon |
| NATIONAL Popular Fits: 5.0L 305cid V8 | 88176 | 🇺🇸 US 🇨🇦 CA | Except flange tear line | View on Amazon |
| BCA Fits: 5.0L 305cid V8 | NS5000 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| FEL-PRO Fits: 5.0L 305cid V8 | 16202 | 🇺🇸 US 🇨🇦 CA | Use with Installation Tool | View on Amazon |
| NATIONAL Fits: 5.0L 305cid V8 | 5000 | 🇺🇸 US 🇨🇦 CA | KitNitrile | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 711347500 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the wear sleeves used to restore a Harmonic Balancer seal surface.
6 Harmonic Balancer Repair Sleeve parts for the 1978 Checker Marathon come from 5 brands — NATIONAL, MAHLE / CLEVITE, BCA and 2 other brands. The "Popular" part is MAHLE / CLEVITE A228.
This group includes MAHLE / CLEVITE A228, NATIONAL 88176 and BCA NS5000 and the remaining parts above.
Intake Manifold Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ARP Fits: 5.0L 305cid V8 | 1342001 | 🇺🇸 US 🇨🇦 CA | Hex Bolt Head | View on Amazon |
| ARP Fits: 5.0L 305cid V8 | 1342101 | 🇺🇸 US 🇨🇦 CA | Black Oxide12 Point Bolt Head | View on Amazon |
| ARP Fits: 5.0L 305cid V8 | 4342001 | 🇺🇸 US 🇨🇦 CA | Stainless Steel Hex Bolt Head | View on Amazon |
| ARP Fits: 5.0L 305cid V8 | 4342101 | 🇺🇸 US 🇨🇦 CA | Stainless Steel12 Point Bolt Head | View on Amazon |
This table covers the Intake Manifold bolts.
ARP supplies the 4 Intake Manifold Bolt parts for the 1978 Checker Marathon.
Part numbers include ARP 1342001, ARP 1342101 and ARP 4342001, among others listed above.
Intake Manifold Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| APEX Popular Fits: 5.0L 305cid V8 | AMS3221 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
| FEL-PRO Popular Fits: 5.0L 305cid V8 | MS903142 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | 95070SG | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | MS15315 | 🇺🇸 US 🇨🇦 CA | CompositeContains One Crossover Restrictor | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | 95128SG | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 111015801 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 111062601 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
This table covers the gaskets between the intake manifold and the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
7 Intake Manifold Gasket parts are listed for the 1978 Checker Marathon, from MAHLE / CLEVITE, VICTOR REINZ, APEX and 1 other brand. APEX AMS3221 carries the "Popular" badge.
This group includes APEX AMS3221, FEL-PRO MS903142 and MAHLE / CLEVITE 95070SG and the remaining parts above.
Oil Drain Plug
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AGS Fits: 5.0L 305cid V8 | ODP00016 | 🇺🇸 US 🇨🇦 CA | 1/2-20 | View on Amazon |
| DORMAN Fits: 5.0L 305cid V8 | 090052 | 🇺🇸 US 🇨🇦 CA | Pilot PointThread Size | View on Amazon |
This table covers the drain plugs in the oil pan.
2 Oil Drain Plug parts for the 1978 Checker Marathon come from 2 brands — AGS and DORMAN.
Listed part numbers: AGS ODP00016 and DORMAN 090052.
Oil Drain Plug Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MAHLE / CLEVITE Popular Fits: 5.0L 305cid V8 | 2051 | 🇺🇸 US 🇨🇦 CA | Composite | View on Amazon |
| VICTOR REINZ Popular Fits: 5.0L 305cid V8 | 711346200 | 🇺🇸 US 🇨🇦 CA | 0.500 IN Inside Diameter | View on Amazon |
| DORMAN Fits: 5.0L 305cid V8 | 097022 | 🇺🇸 US 🇨🇦 CA | Nylon GasketSize | View on Amazon |
| FEL-PRO Fits: 5.0L 305cid V8 | 70822 | 🇺🇸 US 🇨🇦 CA | 0.500 (in) Inside Diameter x 0.900 (in) Outside DiameterFlat Washer | View on Amazon |
| NEEDA Fits: 5.0L 305cid V8 | 67270625 | 🇺🇸 US 🇨🇦 CA | Fits Gaskets Boxed 25 | View on Amazon |
| ULTRA-POWER Fits: 5.0L 305cid V8 | 097022 | 🇺🇸 US 🇨🇦 CA | ID: 0.504"NYLON GASKET | View on Amazon |
This table covers the crush washers and gaskets under the oil drain plug. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
6 Oil Drain Plug Gasket parts are listed for the 1978 Checker Marathon, from MAHLE / CLEVITE, VICTOR REINZ, DORMAN and 3 other brands. MAHLE / CLEVITE 2051 carries the "Popular" badge.
Listed part numbers: MAHLE / CLEVITE 2051, VICTOR REINZ 711346200 and DORMAN 097022, plus the other parts above.
Oil Filter
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CHAMP / LUBER-FINER Fits: 5.0L 305cid V8 | PH454 | 🇺🇸 US 🇨🇦 CA | Anti-Drain Back Valve: YESSpin-On Filter. | View on Amazon |
| PRO-TEC Fits: 5.0L 305cid V8 | PXL51069 | 🇺🇸 US 🇨🇦 CA | Thread Size: 13/16-16 InSpin-On Filter | View on Amazon |
| VARIOUS MFR Fits: 5.0L 305cid V8 | PG5313 | 🇺🇸 US 🇨🇦 CA | Spin-On | View on Amazon |
High Performance / Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOBIL Fits: 5.0L 305cid V8 | M1111A | 🇺🇸 US 🇨🇦 CA | Extended Performance | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Popular Fits: 5.0L 305cid V8 | PF454 | 🇺🇸 US 🇨🇦 CA | GM Original EquipmentGasket Or Seal Included: YES | View on Amazon |
| WIX Popular Fits: 5.0L 305cid V8 | 51069 | 🇺🇸 US 🇨🇦 CA | Burst Pressure: 225 PSIStyle: Spin-On Lube Filter | View on Amazon |
| HASTINGS / BALDWIN Fits: 5.0L 305cid V8 | LF225 | 🇺🇸 US 🇨🇦 CA | Spin-On | View on Amazon |
This table covers the oil filters that screw onto this engine's filter mount. Typical signs include low oil pressure after a service, or a filter that will not spin off because the old gasket stayed on the block. Lube the new gasket and tighten to the spec on the box; a double-gasket install dumps the sump on the first drive.
7 Oil Filter parts for the 1978 Checker Marathon come from 7 brands — CHAMP / LUBER-FINER, PRO-TEC, VARIOUS MFR and 4 other brands. The "Popular" part is ACDELCO PF454.
The Economy section lists 3 options from CHAMP / LUBER-FINER, PRO-TEC and VARIOUS MFR — the catalog's value-priced group. CHAMP / LUBER-FINER PH454 is listed in this group.
The High Performance / Heavy Duty section lists 1 option from MOBIL — grouped under the catalog's "High Performance / Heavy Duty" designation — the notes column spells out what sets them apart. MOBIL M1111A is listed in this group.
Standard Replacement: 3 parts, from ACDELCO, WIX and HASTINGS / BALDWIN. A representative part number is ACDELCO PF454.
Listed part numbers: ACDELCO PF454, CHAMP / LUBER-FINER PH454 and PRO-TEC PXL51069, plus the other parts above.
Oil Pan Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ARP Popular Fits: 5.0L 305cid V8 | 2341802 | 🇺🇸 US 🇨🇦 CA | Black OxideHex Bolt Head | View on Amazon |
| ARP Fits: 5.0L 305cid V8 | 4341802 | 🇺🇸 US 🇨🇦 CA | With Standard 2 Piece Cork GasketStainless Steel Hex Bolt Head | View on Amazon |
| ARP Fits: 5.0L 305cid V8 | 2341901 | 🇺🇸 US 🇨🇦 CA | Stainless SteelHex Bolt Head | View on Amazon |
| ARP Fits: 5.0L 305cid V8 | 2341902 | 🇺🇸 US 🇨🇦 CA | 12 Point Bolt Head | View on Amazon |
| ARP Fits: 5.0L 305cid V8 | 4341804 | 🇺🇸 US 🇨🇦 CA | With 1 Piece Rubber GasketStainless Steel Hex Bolt Head | View on Amazon |
This table covers the Oil Pan bolts.
5 Oil Pan Bolt parts for the 1978 Checker Marathon come from ARP. The "Popular" part is ARP 2341802.
Part numbers include ARP 2341802, ARP 4341802 and ARP 2341901, among others listed above.
Oil Pan Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO Popular Fits: 5.0L 305cid V8 | OS5197C5 | 🇺🇸 US 🇨🇦 CA | Cork | View on Amazon |
| FEL-PRO Popular Fits: 5.0L 305cid V8 | OS34510T | 🇺🇸 US 🇨🇦 CA | PermadryplusIncludes Snaps | View on Amazon |
| APEX Fits: 5.0L 305cid V8 | AOP322 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| ENGINE PRO Fits: 5.0L 305cid V8 | 3118801 | 🇺🇸 US 🇨🇦 CA | Fits Chevrolet Small Block Engines Only | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | OS30568Z | 🇺🇸 US 🇨🇦 CA | Cork-Rubber | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | OS30568ZTC | 🇺🇸 US 🇨🇦 CA | Cork with Metal Carrier | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | OS30568RLH | 🇺🇸 US 🇨🇦 CA | Molded Rubber | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | OS32457 | 🇺🇸 US 🇨🇦 CA | Contains Oil Pan Bolts and WashersMolded Rubber | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 101017201 | 🇺🇸 US 🇨🇦 CA | 1 Piece Design | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 101007801 | 🇺🇸 US 🇨🇦 CA | Molded RubberImproved Design | View on Amazon |
This table covers the gaskets between the oil pan and the block. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
10 Oil Pan Gasket parts for the 1978 Checker Marathon come from 5 brands — MAHLE / CLEVITE, FEL-PRO, VICTOR REINZ and 2 other brands. The "Popular" part is FEL-PRO OS5197C5.
Oil Pump Shaft
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ARP Fits: 5.0L 305cid V8 | 1347901 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Oil Pump shafts.
This group shows a single part: ARP 1347901.
Oil Pump Shaft Guide / Retainer
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO Fits: 5.0L 305cid V8 | 72665 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | H31354 | 🇺🇸 US 🇨🇦 CA | NylonRetainer Material: Plastic | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 711403800 | 🇺🇸 US 🇨🇦 CA | Distributor to oil pump shaft retainer | View on Amazon |
This table covers the Oil Pump Shaft Guide retainers.
3 Oil Pump Shaft Guide / Retainer parts are listed for the 1978 Checker Marathon, from FEL-PRO, MAHLE / CLEVITE and VICTOR REINZ.
Part numbers include FEL-PRO 72665, MAHLE / CLEVITE H31354 and VICTOR REINZ 711403800.
Piston
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | 2242012 | 🇺🇸 US 🇨🇦 CA | Non-Coated | View on Amazon |
| SEALED POWER Fits: 5.0L 305cid V8 | 454NP | 🇺🇸 US 🇨🇦 CA | 0.110in Deep x 3.115in Diameter RecessCast Iron | View on Amazon |
| SILV-O-LITE Fits: 5.0L 305cid V8 | 1449 | 🇺🇸 US 🇨🇦 CA | Offset Pin ConfigurationPress Pin Type | View on Amazon |
| SILV-O-LITE Fits: 5.0L 305cid V8 | 1449K1 | 🇺🇸 US 🇨🇦 CA | Offset Pin ConfigurationPress Pin Type | View on Amazon |
This table covers the pistons that travel in each cylinder. Typical signs include knock, blow-by, or a cylinder that will not hold compression. Piston work is a short-block job. Match bore, pin and ring pack in the notes — not the photo.
4 Piston parts are listed for the 1978 Checker Marathon, from SILV-O-LITE, MAHLE / CLEVITE and SEALED POWER.
Listed part numbers: MAHLE / CLEVITE 2242012, SEALED POWER 454NP and SILV-O-LITE 1449, plus the other parts above.
Piston Ring
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | 41276 | 🇺🇸 US 🇨🇦 CA | PremiumMaterial Cast Iron / Cast Iron / Stainless Steel | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | 41137CP | 🇺🇸 US 🇨🇦 CA | PremiumMaterial Carbon Steel / Cast Iron / Stainless Steel | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | 51137CP | 🇺🇸 US 🇨🇦 CA | SetChrome Facing | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | S51137CP | 🇺🇸 US 🇨🇦 CA | Single Cylinder SetChrome Facing | View on Amazon |
This table covers the rings that seal each piston to the cylinder wall.
MAHLE / CLEVITE supplies the 4 Piston Ring parts for the 1978 Checker Marathon.
The Premium section lists 2 options from MAHLE / CLEVITE — a step above OE specification in materials, tolerances or warranty terms. MAHLE / CLEVITE 41276 is listed in this group.
The Standard Replacement section: 2 options from MAHLE / CLEVITE. MAHLE / CLEVITE 51137CP is listed in this group.
Listed part numbers: MAHLE / CLEVITE 41276, MAHLE / CLEVITE 41137CP and MAHLE / CLEVITE 51137CP, plus the other parts above.
Rocker Arm Stud
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ARP Fits: 5.0L 305cid V8 | 1347103 | 🇺🇸 US 🇨🇦 CA | Installed Height 1.770?Adjuster Thread Length 0.670? | View on Amazon |
| ARP Fits: 5.0L 305cid V8 | 1347104 | 🇺🇸 US 🇨🇦 CA | 3/8" With Roller Rocker | View on Amazon |
| ARP Fits: 5.0L 305cid V8 | 1347101 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| ARP Fits: 5.0L 305cid V8 | 2347201 | 🇺🇸 US 🇨🇦 CA | 3/8-7/16" Rocker Arm Stud Kit | View on Amazon |
This table covers the Rocker Arm studs.
4 Rocker Arm Stud parts for the 1978 Checker Marathon come from ARP.
Part numbers include ARP 1347103, ARP 1347104 and ARP 1347101, among others listed above.
Timing Cam Sprocket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CLOYES Popular Fits: 5.0L 305cid V8 | S390T | 🇺🇸 US 🇨🇦 CA | 0.41 in Tooth Width | View on Amazon |
| FVP Fits: 5.0L 305cid V8 | S390T | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| INA Fits: 5.0L 305cid V8 | ZSS390T | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| S.A. GEAR Fits: 5.0L 305cid V8 | S390T | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| S.A. GEAR Fits: 5.0L 305cid V8 | S390N | 🇺🇸 US 🇨🇦 CA | Nylon | View on Amazon |
This table covers the Timing Cam sprockets.
5 Timing Cam Sprocket parts for the 1978 Checker Marathon come from 4 brands — S.A. GEAR, CLOYES, FVP and 1 other brand. The "Popular" part is CLOYES S390T.
Part numbers include CLOYES S390T and INA ZSS390T, among others listed above.
Timing Camshaft Gear Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ARP Fits: 5.0L 305cid V8 | 2341001 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Timing Camshaft Gear bolts.
One part is listed for the 1978 Checker Marathon — ARP 2341001.
Timing Chain
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CLOYES Fits: 5.0L 305cid V8 | C499 | 🇺🇸 US 🇨🇦 CA | Silent Chain | View on Amazon |
| FVP Fits: 5.0L 305cid V8 | C499 | 🇺🇸 US 🇨🇦 CA | Silent Chain.40 In./.41 In. Tooth Width | View on Amazon |
| INA Fits: 5.0L 305cid V8 | ZCC499 | 🇺🇸 US 🇨🇦 CA | Link Quantity: 46 | View on Amazon |
| S.A. GEAR Fits: 5.0L 305cid V8 | C499 | 🇺🇸 US 🇨🇦 CA | Chain | View on Amazon |
This table covers the timing chains that keep the cams in time with the crank.
4 Timing Chain parts are listed for the 1978 Checker Marathon, from CLOYES, FVP, INA and 1 other brand.
Listed part numbers: CLOYES C499 and INA ZCC499, plus the other parts above.
Timing Chain & Component Kit
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Fits: 5.0L 305cid V8 | CHK196 | 🇺🇸 US 🇨🇦 CA | Includes Timing Chain, 2 Sprockets | View on Amazon |
| S.A. GEAR Fits: 5.0L 305cid V8 | 73001 | 🇺🇸 US 🇨🇦 CA | Includes Cam Sprocket, Chain, Crank Sprocket | View on Amazon |
| SKP Fits: 5.0L 305cid V8 | SKC3001K | 🇺🇸 US 🇨🇦 CA | Includes: Camshaft Sprocket, Crankshaft Sprocket, Chain | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CLOYES Popular Fits: 5.0L 305cid V8 | C3001K | 🇺🇸 US 🇨🇦 CA | Set Contains: Timing Chain, Crankshaft Sprocket, Camshaft SprocketSilent Chain | View on Amazon |
| INA Fits: 5.0L 305cid V8 | ZC1065K | 🇺🇸 US 🇨🇦 CA | Kit Contains 1 Chain, 1 Cam Sprocket, 1 Crank SprocketIncludes Chain Protect Additive | View on Amazon |
This table covers kits that group a timing chain with the related tensioners and guides.
5 Timing Chain & Component Kit parts for the 1978 Checker Marathon come from 5 brands — GATES, S.A. GEAR, SKP and 2 other brands. The "Popular" part is CLOYES C3001K.
The Economy section: 3 options from GATES, S.A. GEAR and SKP. GATES CHK196 is listed in this group.
Standard Replacement: 2 parts, from CLOYES and INA. A representative part number is CLOYES C3001K.
This group includes CLOYES C3001K, GATES CHK196 and S.A. GEAR 73001 and the remaining parts above.
Timing Cover Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| APEX Popular Fits: 5.0L 305cid V8 | ATC3221 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| FEL-PRO Popular Fits: 5.0L 305cid V8 | TCS45121 | 🇺🇸 US 🇨🇦 CA | Repair Sleeve Not Included | View on Amazon |
| FEL-PRO Fits: 5.0L 305cid V8 | TCS45265 | 🇺🇸 US 🇨🇦 CA | with Sleeve 'N' Seal | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | T27781 | 🇺🇸 US 🇨🇦 CA | Paper | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | JV881 | 🇺🇸 US 🇨🇦 CA | Contains Extended Case Lip Relocator Timing Cover Seal, Repair Sleeve Not RequiredSet | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | JV926 | 🇺🇸 US 🇨🇦 CA | Contains Repair SleeveSet | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 151017001 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 151026701 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
This table covers the gaskets that seal the Timing Cover. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
8 Timing Cover Gasket parts for the 1978 Checker Marathon come from 4 brands — MAHLE / CLEVITE, FEL-PRO, VICTOR REINZ and 1 other brand. The "Popular" part is APEX ATC3221.
This group includes APEX ATC3221, FEL-PRO TCS45121 and FEL-PRO TCS45265 and the remaining parts above.
Timing Cover Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SCHAEFFLER Fits: 5.0L 305cid V8 | SR3498 | 🇺🇸 US 🇨🇦 CA | 17.48 mm Width61.3 mm Outside Diameter | View on Amazon |
| SKF Fits: 5.0L 305cid V8 | 480177 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| SKF Fits: 5.0L 305cid V8 | 99176 | 🇺🇸 US 🇨🇦 CA | Shaft Diameter: 1.766 In | View on Amazon |
This table covers the wear sleeves used to restore a Timing Cover seal surface.
3 Timing Cover Repair Sleeve parts for the 1978 Checker Marathon come from 2 brands — SKF and SCHAEFFLER.
This group includes SCHAEFFLER SR3498, SKF 480177 and SKF 99176.
Timing Cover Repair Sleeve Tool
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO Fits: 5.0L 305cid V8 | 16312 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Timing Cover Repair Sleeve tools. This is a service tool, not a wear part — match the application in the notes.
This group shows a single part: FEL-PRO 16312.
Timing Cover Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MAHLE / CLEVITE Popular Fits: 5.0L 305cid V8 | 65022 | 🇺🇸 US 🇨🇦 CA | Rubber1/2" Wide | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | 49328 | 🇺🇸 US 🇨🇦 CA | Rubber3/8" Wide | View on Amazon |
| SCHAEFFLER Fits: 5.0L 305cid V8 | SS2784 | 🇺🇸 US 🇨🇦 CA | Front9.53 mm Width | View on Amazon |
| SKF Fits: 5.0L 305cid V8 | 17286 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 191035801 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the seals at the Timing Cover. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
5 Timing Cover Seal parts for the 1978 Checker Marathon come from 4 brands — MAHLE / CLEVITE, SCHAEFFLER, SKF and 1 other brand. The "Popular" part is MAHLE / CLEVITE 65022.
Part numbers include MAHLE / CLEVITE 65022, MAHLE / CLEVITE 49328 and SCHAEFFLER SS2784, among others listed above.
Timing Crank Sprocket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CLOYES Fits: 5.0L 305cid V8 | S391 | 🇺🇸 US 🇨🇦 CA | with 18 Teeth on Crankshaft | View on Amazon |
| FVP Fits: 5.0L 305cid V8 | S391 | 🇺🇸 US 🇨🇦 CA | with 18 Teeth on Crankshaft | View on Amazon |
| INA Fits: 5.0L 305cid V8 | ZSS391 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| S.A. GEAR Fits: 5.0L 305cid V8 | S391 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the crankshaft sprockets that drive the timing chain or belt.
4 Timing Crank Sprocket parts for the 1978 Checker Marathon come from 4 brands — CLOYES, FVP, INA and 1 other brand.
Part numbers include CLOYES S391 and INA ZSS391, among others listed above.
Valve Cover Gasket
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO Popular Fits: 5.0L 305cid V8 | VS12869T | 🇺🇸 US 🇨🇦 CA | Permadryplus | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | VS50732 | 🇺🇸 US 🇨🇦 CA | SetIncludes Washers | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 151057501 | 🇺🇸 US 🇨🇦 CA | SetImproved Design | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO Popular Fits: 5.0L 305cid V8 | VS12869 | 🇺🇸 US 🇨🇦 CA | Cork | View on Amazon |
| FEL-PRO Popular Fits: 5.0L 305cid V8 | VS12869R | 🇺🇸 US 🇨🇦 CA | Rubber | View on Amazon |
| FEL-PRO Popular Fits: 5.0L 305cid V8 | VS12869AC | 🇺🇸 US 🇨🇦 CA | Cork | View on Amazon |
| APEX Fits: 5.0L 305cid V8 | AVC322 | 🇺🇸 US 🇨🇦 CA | 5/32" Thick | View on Amazon |
| APEX Fits: 5.0L 305cid V8 | AVC322T | 🇺🇸 US 🇨🇦 CA | 7/32" Thick | View on Amazon |
| FEL-PRO Fits: 5.0L 305cid V8 | VS50265C | 🇺🇸 US 🇨🇦 CA | High Temperature DesignCork | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | VS38110 | 🇺🇸 US 🇨🇦 CA | Cork-RubberMounting Hole Quantity: 12 | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | VS38110R | 🇺🇸 US 🇨🇦 CA | SetMolded Rubber | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | VS38110TC | 🇺🇸 US 🇨🇦 CA | Cork with Metal CarrierMounting Hole Quantity: 8 | View on Amazon |
| ULTRA-POWER Fits: 5.0L 305cid V8 | VS12869 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 151058701 | 🇺🇸 US 🇨🇦 CA | SetCork | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 151050201 | 🇺🇸 US 🇨🇦 CA | SetHigh Temperature Design | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 151050101 | 🇺🇸 US 🇨🇦 CA | SetCork | View on Amazon |
This table covers the gaskets that seal the valve cover to the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
16 Valve Cover Gasket parts for the 1978 Checker Marathon come from 5 brands — FEL-PRO, MAHLE / CLEVITE, VICTOR REINZ and 2 other brands. The "Popular" part is FEL-PRO VS12869T.
Premium: 3 parts, from FEL-PRO, MAHLE / CLEVITE and VICTOR REINZ. A representative part number is FEL-PRO VS12869T.
Standard Replacement: 13 parts, from FEL-PRO, MAHLE / CLEVITE, VICTOR REINZ and 2 other brands. A representative part number is FEL-PRO VS12869.
Valve Cover Load Spreader
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO Fits: 5.0L 305cid V8 | ES72676 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | GS33825 | 🇺🇸 US 🇨🇦 CA | Engine Valve Cover Load Spreader SetSteel | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 181003401 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Valve Cover Load spreaders.
3 Valve Cover Load Spreader parts are listed for the 1978 Checker Marathon, from FEL-PRO, MAHLE / CLEVITE and VICTOR REINZ.
Part numbers include FEL-PRO ES72676, MAHLE / CLEVITE GS33825 and VICTOR REINZ 181003401.
Valve Stem Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO Popular Fits: 5.0L 305cid V8 | SS5112 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
| FEL-PRO Popular Fits: 5.0L 305cid V8 | SS10058 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
| APEX Fits: 5.0L 305cid V8 | AVS3022 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | SS45229 | 🇺🇸 US 🇨🇦 CA | SetMolded Rubber | View on Amazon |
| MAHLE / CLEVITE Fits: 5.0L 305cid V8 | SS45264 | 🇺🇸 US 🇨🇦 CA | SetMolded Rubber | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 121001801 | 🇺🇸 US 🇨🇦 CA | SetContains 8 Pieces | View on Amazon |
| VICTOR REINZ Fits: 5.0L 305cid V8 | 121004001 | 🇺🇸 US 🇨🇦 CA | SetContains 16 Pieces | View on Amazon |
This table covers the seals on each valve stem that control oil into the guides. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
7 Valve Stem Seal parts for the 1978 Checker Marathon come from 4 brands — FEL-PRO, MAHLE / CLEVITE, VICTOR REINZ and 1 other brand. The "Popular" part is FEL-PRO SS5112.
Part numbers include FEL-PRO SS5112, FEL-PRO SS10058 and APEX AVS3022, among others listed above.
Buying Engine Parts for a 1978 Checker Marathon
On this vehicle, the engine covers the internals and hard parts that build compression and keep oil where it belongs — gaskets, bearings, camshafts, lifters, seals and timing components.
- Match the engine first. Every engine part here is engine-specific; each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the seals and gaskets for anything you open up; a timing job should always include the tensioner and guides, not just the belt or chain.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Connecting Rod Bearing and Crankshaft Main Bearing .
Frequently Asked Questions
How many engine parts fit the 1978 Checker Marathon?
Our catalog currently lists 256 engine parts for the 1978 Checker Marathon across 42 subcategories and 34 brands, covering all 3 engine options (4.1L 250cid L6, 5.0L 305cid V8 and 5.7L 350cid V8). Each part is matched to the engine(s) it fits.
Do engine parts differ between 1978 Checker Marathon engines?
Yes. Every engine part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of engine problems on a 1978 Checker Marathon?
Common symptoms include oil spots under the vehicle, blue or white exhaust smoke, ticking from the valvetrain, or coolant mysteriously disappearing. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the seals and gaskets for anything you open up; a timing job should always include the tensioner and guides, not just the belt or chain.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 1978 Checker Marathon was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 1978 Checker Marathon?
First match the engine — each row shows which engine(s) the part fits. Then engine hard parts are unforgiving of guesswork — confirm the casting or engine code before ordering, because one model year can hide two different blocks. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 1978 Checker Marathon
Engine Parts for Other Checker Marathon Years
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