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Champion 312 Spark Plug
| Brand | Champion 312 |
|---|---|
| Center Electrode Diameter (Inch) | 0.1 |
| Center Electrode Tip Material | Nickel |
| Classification | Champion Copper Plus Small Engine |
| Electrical Terminal Type | Removable Nut |
| Ground Electrode Core Material | Nickel |
| Ground Electrode Material | Nickel Copper Alloy |
| Ground Electrode Quantity | 1 |
| Hex Size | 0.813 |
| Hex Size | 20.650 |
| Hex Type | Hex |
| Installed Height (Inch) | 2.24 |
| Insulator Height | 0.06 |
| Insulator Projection (Inch) | 0.06 |
| Manufacturer Heat Range | 87 |
| Plug Type | L87YC |
| Pre-Gap Size | 0.025 |
| Pre-Gap Size | 0.64 |
| Reach | 0.5 |
| Resistor Type | No |
| Seat Type | Flat |
| Taper Diameter (Inch) | 0.31 |
| Thread Diameter | 0.551 |
| Thread Diameter | 14.000 |
| Product line | Copper Plus |
| Fits | Hyosung, Yamaha, Honda, Volvo, Citroen, Subaru, Triumph, Morgan, Mercedes-Benz, Jeep, Renault, and Pontiac · 6 vehicles |
Copper core electrode. Improves conductivity and heat control for steady wear.
Nickel center electrode. Supports dependable performance and consistent ignition.
Removable nut terminal. Offers flexible connection options during installation.
Cross-references AMS Automotive 4114, AMS Automotive 6326 and Anchor 3068 for the same application. See all 34.
Champion Copper Plus 312 Spark Plug
Champion Copper Plus 312 is a non-resistor spark plug built for dependable ignition performance in small-engine and OE-style applications. It uses a copper core electrode to improve conductivity and heat control, helping maintain consistent wear characteristics in service.
Fits 1962 Pontiac Tempest, N/A. Fits 1963 Jeep Wagoneer, N/A. Fits 1964-1967 Jeep Wagoneer, N/A.
Key Features
- Copper core electrode for improved conductivity and heat management
- Nickel center electrode tip and nickel ground electrode core material
- Non-resistor design for applications that specify a resistor-free plug
- Flat seat design with 0.5 in. reach and 14 mm thread diameter
- Pre-gapped at 0.025 in. / 0.64 mm
- Champion Copper Plus Small Engine classification
- Plug type L87YC
Detailed Description
Champion part number 312 is a Copper Plus spark plug engineered around a copper core electrode for stable conductivity and heat control. The nickel center electrode tip, nickel copper alloy ground electrode, and single ground electrode layout support steady ignition performance in applications that call for a Champion L87YC plug. With a flat seat, 0.5-inch reach, 14 mm thread diameter, and non-resistor construction, this spark plug matches the specifications commonly required in older Jeep and Pontiac applications, including 1962 Pontiac Tempest and 1963-1967 Jeep Wagoneer models. This part cross-references DENSO Auto Parts 4511 for the same application.
Common Issues This Part Can Address
- Hard starting caused by worn or fouled spark plugs
- Misfire from weak spark delivery at the plug
- Rough idle related to inconsistent ignition performance
- Loss of throttle response from degraded plug electrodes
- Heat-related plug wear in engines that specify copper-core plugs
Installation Notes and Tips
- Verify the engine calls for plug type L87YC, a flat-seat design, and 0.5-inch reach before installation.
- Check the specified gap for the vehicle application; this plug is pre-gapped at 0.025 in. / 0.64 mm.
- Confirm the non-resistor requirement when servicing ignition systems that call for a resistor-free plug.
- Inspect threads and sealing surfaces during service to ensure proper seating and consistent ignition performance.
Quality Assurance
Champion Copper Plus plugs are built around the brand’s copper-core design for conductivity and heat control, with materials and dimensions listed to support accurate OE-style replacement selection. Part number 312 is specified for confirmed applications including 1962 Pontiac Tempest and 1963-1967 Jeep Wagoneer.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1967 | Jeep | Wagoneer | 3.8L | L6 | N/A | 1/2 (in) Reach Spark Plugs; Non-Resistor Type; Gap 0.030 (in); Actual OE Part; Plug Type Number L87YC; Copper Plus |
| 1966 | Jeep | Wagoneer | 3.8L | L6 | N/A | 1/2 (in) Reach Spark Plugs; Non-Resistor Type; Gap 0.030 (in); Actual OE Part; Plug Type Number L87YC; Copper Plus |
| 1965 | Jeep | Wagoneer | 3.8L | L6 | N/A | 1/2 (in) Reach Spark Plugs; Non-Resistor Type; Gap 0.030 (in); Actual OE Part; Plug Type Number L87YC; Copper Plus |
| 1964 | Jeep | Wagoneer | 3.8L | L6 | N/A | 1/2 (in) Reach Spark Plugs; Non-Resistor Type; Gap 0.030 (in); Actual OE Part; Plug Type Number L87YC; Copper Plus |
| 1963 | Jeep | Wagoneer | 3.8L | L6 | N/A | Non-Resistor Type; OE Type; Gap 0.030 (in); Plug Type Number L87YC; Copper Plus |
| 1962 | Pontiac | Tempest | 3.5L | V8 | N/A | Non-Resistor Type; OE Type; Gap 0.035 (in); Plug Type Number L87YC; Copper Plus |
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