Champion 18 Spark Plug

Champion Copper Plus 18 Spark Plug

Champion Copper Plus 18 is a tapered-seat spark plug built for dependable ignition performance in a wide range of older Ford, Chevrolet, GMC, Buick, Pontiac, and related applications. Its copper core electrode improves conductivity and heat control, while the nickel center and ground electrode materials support consistent wear characteristics.

For buyers searching for a Champion 18 spark plug, RV15YC4 replacement, or an OE-style spark plug for classic truck and car tune-ups, this part is a direct match for many 1970s through 1990s applications, including Ford F-150, Ford F-250, Chevrolet Camaro, and GMC C/K truck fitments.

Key Features

• Copper core electrode for improved conductivity and heat management
• Nickel center electrode tip and nickel ground electrode core material
• Pre-gapped at 0.045 in. / 1.15 mm
• Resistor-type spark plug for ignition system noise control
• Tapered seat design with 14 mm thread diameter and 0.441 in. reach
• Champion Copper Plus line for OE-style service replacement

Product Details

Champion Copper Plus 18 uses a copper-core design to help transfer heat away from the firing tip and maintain stable spark plug temperatures during operation. The nickel electrode construction supports good overall wear, making it a practical service part for routine ignition maintenance. This plug is identified as RV15YC4 and cross-references Bosch 4018 for the same application.

Compatible With many Ford F-150, Ford F-250, Ford Bronco, Chevrolet Camaro, Chevrolet Corvette, GMC Jimmy, and Pontiac Firebird applications listed in the fitment data, this spark plug is a strong choice when replacing worn plugs on older carbureted and early fuel-injected engines.

What It Helps Solve

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent spark delivery
• Misfire conditions related to electrode wear
• Reduced throttle response from weak ignition performance
• Heat-related plug wear in higher-mileage engines

Installation Notes and Tips

Verify the plug type, thread diameter, reach, and seat style before installation. The pre-gap is set at 0.045 in., but always confirm the required gap for the specific engine application in the vehicle service information. Use proper torque procedures for tapered-seat plugs and inspect ignition wires, distributor components, and coil output during service.

Fitment examples include 1996-1997 Ford F-250, 1996 Ford Bronco, 1996 Ford F-150, 1987-1993 Ford Mustang, 1988-1992 Chevrolet Camaro, and 1991-1993 GMC Sonoma, all in the positions listed in the fitment data.

Quality Assurance

Champion Copper Plus is a recognized spark plug line used across a broad range of OE-style replacement applications. Part number 18 is built to the listed specifications for consistent fitment and ignition service across supported vehicles.