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Champion 121 Spark Plug
| Brand | Champion 121 |
|---|---|
| Center Electrode Diameter (Inch) | 0.1 |
| Center Electrode Tip Material | Nickel |
| Classification | Champion Copper Plus |
| Electrical Terminal Type | Non-Removable Nut |
| Ground Electrode Core Material | Nickel |
| Ground Electrode Material | Nickel Copper Alloy |
| Ground Electrode Quantity | 1 |
| Hex Size | 0.625 |
| Hex Size | 15.880 |
| Hex Type | Hex |
| Installed Height (Inch) | 2.02 |
| Manufacturer Heat Range | 8 |
| Plug Type | RV8C |
| Pre-Gap Size | 0.040 |
| Pre-Gap Size | 1.02 |
| Reach | 0.441 |
| Resistor Type | Yes |
| Seat Type | Tapered |
| Taper Diameter (Inch) | 0.31 |
| Thread Diameter | 0.551 |
| Thread Diameter | 14.000 |
| Product line | Copper Plus |
| Fits | Chevrolet, Pontiac, and Iso · 11 vehicles |
Copper core electrode. Improves conductivity and heat control for steady wear.
Champion Copper Plus. Dependable performance from Champion's copper plug line.
Resistor type. Helps reduce electrical noise for smoother operation.
Cross-references Anchor 2927, Autolite 144 and Autolite 145 for the same application. See all 29.
Champion Copper Plus 121 Spark Plug
Champion Copper Plus 121 is a tapered-seat spark plug built for dependable ignition performance in classic GM and Pontiac applications. It uses a copper core electrode for improved conductivity and heat control, with nickel-based electrode materials for steady wear characteristics.
The Copper Plus line focuses on practical, OE-style serviceability for drivers maintaining older vehicles such as the 1970 Chevrolet Camaro, Corvette, Impala, Nova, and the 1970-1971 Pontiac Acadian, Laurentian, and Parisienne. Part number 121 is a direct-reference spark plug for RV8C applications.
Key Features
- Copper core electrode for conductivity and heat management
- Nickel center electrode tip and nickel ground electrode materials
- Resistor design for ignition system noise control
- Tapered seat construction
- Pre-gapped at 0.040 in / 1.02 mm
- 14 mm thread diameter with 0.441 in reach
- Non-removable nut terminal and 0.625 in hex size
Product Details
Champion Copper Plus 121 is a spark plug in the Champion Copper Plus line, built around a copper-core design that supports conductivity and heat transfer while maintaining consistent wear. The RV8C plug type, tapered seat, and 8 heat range make it a fitment-specific choice for select 1970 Chevrolet and 1970-1971 Pontiac engines. If you are searching for a Champion 121 spark plug for a 1970 Chevrolet Camaro or a 1970 Pontiac Acadian, this part matches the listed OE-style applications.
This part cross-references DENSO Auto Parts 5038 and Autolite 144 for the same application.
What It Helps Address
- Misfire caused by worn or heat-affected spark plugs
- Hard starting from weak ignition output
- Rough idle in older carbureted engines
- Inconsistent combustion from incorrect plug heat range or gap
- Service replacement needs for RV8C tapered-seat applications
Installation Notes and Tips
Verify the engine calls for an RV8C-style tapered-seat plug before installation. Confirm thread diameter, reach, and heat range against the vehicle service specification, then set the gap to the engine requirement if a different gap is specified. For listed applications, this includes 1970 Chevrolet Bel Air, Caprice, Corvette, Impala, Monte Carlo, Nova, and 1970-1971 Pontiac Acadian, Laurentian, and Parisienne.
Use proper spark plug socket clearance for the 0.625 in hex and inspect ignition wires, coil condition, and plug wells during service. For a 1970 Chevrolet Camaro with the 375 horsepower engine, confirm the 7/16 in reach and OE-type notes before installation.
Quality Assurance
Champion Copper Plus plugs are built around a copper-core electrode design for dependable performance, conductivity, and heat control in service applications. Part number 121 is specified for the listed OE-style fitments, including 1970 Chevrolet Camaro and 1970 Pontiac Corvette applications.
- Fits 1970 Chevrolet Bel Air, N/A
- Fits 1970 Chevrolet Camaro, N/A; 7/16 in reach spark plugs; OE type; with 375 horsepower engine; gap 0.035 in; plug type number RV8C; Copper Plus
- Fits 1970 Chevrolet Caprice, N/A
- Fits 1970 Chevrolet Corvette, N/A
- Fits 1970 Chevrolet Impala, N/A
- Fits 1970 Chevrolet Monte Carlo, N/A
- Fits 1970 Chevrolet Nova, N/A
- Fits 1970-1971 Pontiac Acadian, N/A; OE type; tapered seat; gap 0.035 in; plug type number RV8C; Copper Plus
- Fits 1970 Pontiac Laurentian, N/A; OE type; tapered seat; gap 0.035 in; plug type number RV8C; Copper Plus
- Fits 1970 Pontiac Parisienne, N/A; OE type; tapered seat; gap 0.035 in; plug type number RV8C; Copper Plus
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1971 | Pontiac | Acadian | 7.4L | V8 | N/A | OE Type; Tapered Seat; Gap 0.035 (in); Plug Type Number RV8C; Copper Plus |
| 1970 | Chevrolet | Bel Air | 7.4L | V8 | N/A | OE Type; Gap 0.035 (in); Plug Type Number RV8C; Copper Plus |
| 1970 | Chevrolet | Camaro | 6.6L | V8 | N/A | 7/16 (in) Reach Spark Plugs; OE Type; with 375 Horsepower Engine; Gap 0.035 (in); Plug Type Number RV8C; Copper Plus |
| 1970 | Chevrolet | Caprice | 7.4L | V8 | N/A | OE Type; Gap 0.035 (in); Plug Type Number RV8C; Copper Plus |
| 1970 | Chevrolet | Corvette | 7.4L | V8 | N/A | OE Type; Gap 0.035 (in); Plug Type Number RV8C; Copper Plus |
| 1970 | Chevrolet | Impala | 7.4L | V8 | N/A | Gap 0.035 inches; Plug Type Number RV8C; Copper Plus |
| 1970 | Chevrolet | Monte Carlo | 7.4L | V8 | N/A | OE Type; Gap 0.035 (in); Plug Type Number RV8C; Copper Plus |
| 1970 | Chevrolet | Nova | 7.4L | V8 | N/A | OE Type; Gap 0.035 (in); Plug Type Number RV8C; Copper Plus |
| 1970 | Pontiac | Acadian | 7.4L | V8 | N/A | OE Type; Tapered Seat; Gap 0.035 (in); Plug Type Number RV8C; Copper Plus |
| 1970 | Pontiac | Laurentian | 7.4L | V8 | N/A | OE Type; Tapered Seat; Gap 0.035 (in); Plug Type Number RV8C; Copper Plus |
| 1970 | Pontiac | Parisienne | 7.4L | V8 | N/A | OE Type; Tapered Seat; Gap 0.035 (in); Plug Type Number RV8C; Copper Plus |
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