22 Ignition parts are listed for the 1973 Avanti Ii, in 3 part types, covering the 6.6L 400cid V8 engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
The ignition system on the 1973 Avanti Ii 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).
The 1973 Avanti Ii came with a single engine, the 6.6L 400cid V8, and every part is verified against it.
11 brands supply ignition parts for the 1973 Avanti Ii, led by ACDELCO (4 parts), DENSO (4 parts) and CHAMPION (3 parts), plus 8 more brands. Quality grades include Copper / Nickel, Platinum and Economy.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 1973 Avanti Ii. 5 parts have it, including ACDELCO U505 (Ignition Coil) and ACDELCO CR43TS (Spark Plug). Each part number opens a page with 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 are listed for the 1973 Avanti Ii, from FEL-PRO, MAHLE / CLEVITE and VICTOR REINZ.
This group includes FEL-PRO 70194, MAHLE / CLEVITE B25934 and VICTOR REINZ 711350200.
Ignition Coil
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP | UC12F | 🇺🇸 US 🇨🇦 CA | with 12 Volt Systemwith External Resistor | View on Amazon |
| SKP | SKUC12 | 🇺🇸 US 🇨🇦 CA | with 12 Volt Systemfor with External Resistor. | View on Amazon |
| STANDARD MOTOR PRODUCTS | UC12T | 🇺🇸 US 🇨🇦 CA | T-Series | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Popular | U505 | 🇺🇸 US 🇨🇦 CA | Professional | View on Amazon |
| WELLS Popular | 5C1026 | 🇺🇸 US 🇨🇦 CA | Requires External Resistor: YES | View on Amazon |
| STANDARD MOTOR PRODUCTS | UC12 | 🇺🇸 US 🇨🇦 CA | with 12 Volt Systemwith External Resistor | 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 for the 1973 Avanti Ii come from 5 brands — STANDARD MOTOR PRODUCTS, FVP, SKP and 2 other brands. The "Popular" part is ACDELCO U505.
The Economy section lists 3 options from FVP, SKP and STANDARD MOTOR PRODUCTS — the catalog's value-priced group. FVP UC12F is listed in this group.
In the Standard Replacement grade, ACDELCO, WELLS and STANDARD MOTOR PRODUCTS supply 3 parts: built to original-equipment specification. A representative part number is ACDELCO U505.
This group includes ACDELCO U505, FVP UC12F and SKP SKUC12 and the remaining parts above.
Spark Plug
Summary: Notes include pre-set gaps of 0.035", 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 are listed for the 1973 Avanti Ii, from DENSO, ACDELCO, CHAMPION and 2 other brands. ACDELCO CR43TS carries the "Popular" badge.
In the Copper / Nickel grade, ACDELCO, CHAMPION, DENSO and 1 other brand supply 4 parts: grouped under the catalog's "Copper / Nickel" designation — the notes column spells out what sets them apart. A representative part number is ACDELCO CR43TS.
In the Double Platinum (lasts up to 3x longer than Copper / Nickel) grade, ACDELCO and CHAMPION supply 2 parts: 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. A representative part number is ACDELCO 41803.
The Iridium (lasts up to 4x longer than Copper / Nickel) section lists 3 options from DENSO and SKP — grouped under the catalog's "Iridium (lasts up to 4x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. DENSO 5330 is listed in this group.
In the Platinum (lasts up to 2x longer than Copper / Nickel) grade, ACDELCO, CHAMPION, DENSO and 1 other brand supply 4 parts: grouped under the catalog's "Platinum (lasts up to 2x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. A representative part number is ACDELCO 2.
Buying Ignition Parts for a 1973 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 6.6L 400cid 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 1973 Avanti Ii?
Our catalog currently lists 22 ignition parts for the 1973 Avanti Ii across 3 subcategories and 11 brands, covering the 6.6L 400cid V8 engine. Each part is matched to the engine(s) it fits.
What are the signs of ignition problems on a 1973 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 1973 Avanti Ii?
Notes on this page include pre-set gaps of 0.035", 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 1973 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 1973 Avanti Ii?
Every part on this page is matched to the 6.6L 400cid 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 1973 Avanti Ii
Ignition Parts for Other Avanti Ii Years
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