The 1978 Avanti Ii has 22 ignition parts with verified fitment on this page — 3 part types and 12 brands, covering the 5.7L 350cid V8 engine. Each part includes a manufacturer part number and application notes.
On the 1978 Avanti Ii, the ignition system delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules. All 22 listed parts are Spark Plug (13 parts), Ignition Coil (6 parts) and Distributor Mounting Gasket (3 parts).
Every part on this page is matched to the 5.7L 350cid V8 — the only engine offered in the 1978 Avanti Ii.
The most listed brands for 1978 Avanti Ii ignition parts are ACDELCO (4 parts), DENSO (4 parts) and CHAMPION (3 parts), plus 9 more brands. Quality grades include Copper / Nickel, Platinum and Economy.
5 parts on this 1978 Avanti Ii page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including STANDARD MOTOR PRODUCTS DR31 (Ignition Coil) and ACDELCO CR43TS (Spark Plug). Click any part number to see every vehicle that part fits.
Distributor Mounting Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO | 70194 | 🇺🇸 US 🇨🇦 CA | Thickness: 0.053 In | View on Amazon |
| MAHLE / CLEVITE | B25934 | 🇺🇸 US 🇨🇦 CA | Paper | View on Amazon |
| VICTOR REINZ | 711350200 | 🇺🇸 US 🇨🇦 CA | Inside Diameter: 1.280 In | View on Amazon |
This table covers the gaskets that seal the Distributor Mounting. 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.
3 Distributor Mounting Gasket parts for the 1978 Avanti Ii come from 3 brands — FEL-PRO, MAHLE / CLEVITE and VICTOR REINZ.
Listed part numbers: FEL-PRO 70194, MAHLE / CLEVITE B25934 and VICTOR REINZ 711350200.
Ignition Coil
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP | DR31F | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| HOLSTEIN | 2IGC0022 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS | DR31T | 🇺🇸 US 🇨🇦 CA | T-Series | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular | DR31 | 🇺🇸 US 🇨🇦 CA | Blue Streak | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Popular | 5C1024 | 🇺🇸 US 🇨🇦 CA | Requires External Resistor: YES | View on Amazon |
| ACDELCO | D504A | 🇺🇸 US 🇨🇦 CA | ProfessionalDoes Not Include Contact Shown in Images | View on Amazon |
This table covers the coils that fire each spark plug. Typical signs include a misfire that follows one cylinder, a snap in damp weather, or a coil that is swollen or cracked. Swap a suspect coil with a neighbor to confirm, then replace boots that tore on the way off.
6 Ignition Coil parts are listed for the 1978 Avanti Ii, from STANDARD MOTOR PRODUCTS, FVP, HOLSTEIN and 2 other brands. STANDARD MOTOR PRODUCTS DR31 carries the "Popular" badge.
In the Economy grade, FVP, HOLSTEIN and STANDARD MOTOR PRODUCTS supply 3 parts: the catalog's value-priced group. A representative part number is FVP DR31F.
The Premium section lists 1 option from STANDARD MOTOR PRODUCTS — a step above OE specification in materials, tolerances or warranty terms. STANDARD MOTOR PRODUCTS DR31 is listed in this group.
The Standard Replacement section lists 2 options from WELLS and ACDELCO — built to original-equipment specification. WELLS 5C1024 is listed in this group.
This group includes STANDARD MOTOR PRODUCTS DR31, FVP DR31F and HOLSTEIN 2IGC0022 and the remaining parts above.
Spark Plug
Summary: Notes include pre-set gaps of 0.040", 0.043", 0.044" and 0.045". Replacement brands in this table include DENSO, ACDELCO and CHAMPION.
Copper / Nickel
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Popular | CR43TS | 🇺🇸 US 🇨🇦 CA | ProfessionalConventional | View on Amazon |
| CHAMPION Popular | 18 | 🇺🇸 US 🇨🇦 CA | Copper PlusPre-Set Gap: 0.045" | View on Amazon |
| DENSO | 5026 | 🇺🇸 US 🇨🇦 CA | U-Groove ConventionalPre-Set Gap: 0.044" | View on Amazon |
| MOTORCRAFT | SP450X | 🇺🇸 US 🇨🇦 CA | Copper | View on Amazon |
Double Platinum (lasts up to 3x longer than Copper / Nickel)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO | 41803 | 🇺🇸 US 🇨🇦 CA | ProfessionalDouble Platinum | View on Amazon |
| CHAMPION | 7018 | 🇺🇸 US 🇨🇦 CA | Double Platinum PowerPre-Set Gap: 0.04" | View on Amazon |
Iridium (lasts up to 4x longer than Copper / Nickel)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DENSO | 5330 | 🇺🇸 US 🇨🇦 CA | Iridium PowerPre-Set Gap: 0.044" | View on Amazon |
| DENSO | 4715 | 🇺🇸 US 🇨🇦 CA | Iridium TTPre-Set Gap: 0.040" | View on Amazon |
| SKP | SP1009 | 🇺🇸 US 🇨🇦 CA | Tapered Ground Electrode with Platinum Chip | View on Amazon |
Platinum (lasts up to 2x longer than Copper / Nickel)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Popular | 2 | 🇺🇸 US 🇨🇦 CA | GoldRapidfire | View on Amazon |
| CHAMPION | 3018 | 🇺🇸 US 🇨🇦 CA | Platinum PowerPre-Set Gap: 0.04" | View on Amazon |
| DENSO | 4509 | 🇺🇸 US 🇨🇦 CA | Platinum TTPre-Set Gap: 0.040" | View on Amazon |
| MOTORCRAFT | SP502 | 🇺🇸 US 🇨🇦 CA | Platinum | View on Amazon |
This table covers the spark plugs for this engine. Typical signs include misfire under load, rough idle, or a flashing check-engine light. Verify the gap even on pre-gapped plugs, and replace coil boots that come off a high-mileage engine.
13 Spark Plug parts for the 1978 Avanti Ii come from 5 brands — DENSO, ACDELCO, CHAMPION and 2 other brands. The "Popular" part is ACDELCO CR43TS.
The Copper / Nickel section lists 4 options from ACDELCO, CHAMPION, DENSO and 1 other brand — grouped under the catalog's "Copper / Nickel" designation — the notes column spells out what sets them apart. ACDELCO CR43TS is listed in this group.
The Double Platinum (lasts up to 3x longer than Copper / Nickel) section lists 2 options from ACDELCO and CHAMPION — grouped under the catalog's "Double Platinum (lasts up to 3x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. ACDELCO 41803 is listed in this group.
In the Iridium (lasts up to 4x longer than Copper / Nickel) grade, DENSO and SKP supply 3 parts: grouped under the catalog's "Iridium (lasts up to 4x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. A representative part number is DENSO 5330.
The Platinum (lasts up to 2x longer than Copper / Nickel) section lists 4 options from ACDELCO, CHAMPION, DENSO and 1 other brand — grouped under the catalog's "Platinum (lasts up to 2x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. ACDELCO 2 is listed in this group.
Buying Ignition Parts for a 1978 Avanti Ii
On this vehicle, the ignition system delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules.
- Confirm you have the 5.7L 350cid V8 engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Spark Plug and Ignition Coil .
Frequently Asked Questions
How many ignition parts fit the 1978 Avanti Ii?
Our catalog currently lists 22 ignition parts for the 1978 Avanti Ii across 3 subcategories and 12 brands, covering the 5.7L 350cid V8 engine. Each part is matched to the engine(s) it fits.
What are the signs of ignition problems on a 1978 Avanti Ii?
Common symptoms include misfires under load, rough idle, flashing check-engine light, or poor starting in damp weather. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What spark-plug gap is listed for the 1978 Avanti Ii?
Notes on this page include pre-set gaps of 0.040", 0.043", 0.044" and 0.045". Still verify against spec — even “pre-gapped” plugs should be checked before they go in.
What should I replace at the same time?
Where labor overlaps, replace plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.
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 Avanti Ii 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 Avanti Ii?
Every part on this page is matched to the 5.7L 350cid V8 engine. Then gap matters even on “pre-gapped” plugs — verify against spec, and replace coil boots when they come off a high-mileage engine. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 1978 Avanti Ii
Ignition Parts for Other Avanti Ii Years
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