Champion 412 Spark Plug

Champion Copper Plus 412 Spark Plug

Champion Copper Plus 412 is a replacement spark plug built around a copper core electrode for strong conductivity and heat control. It is an OE-style ignition service part for Chrysler, Dodge, Jeep, and Plymouth applications that call for plug type RC12LYC and a 0.035 in gap.

Use this spark plug when servicing vehicles such as the Dodge Viper, Jeep Cherokee, and Jeep Wrangler with the specified factory-style ignition setup. The Champion 412 part number is also listed as an interchange for several OE and aftermarket references, making it a practical match for secondary ignition maintenance.

Key Features

• Copper core electrode for conductivity and heat management
• Nickel center electrode tip and nickel ground electrode core material
• Pre-gapped to 0.035 in (0.89 mm)
• Resistor type plug for ignition system noise control
• Flat seat design with 0.75 in reach
• 14 mm thread diameter and 0.625 in hex size
• Champion Copper Plus classification, plug type RC12LYC

Product Details

Champion Copper Plus 412 is a conventional spark plug designed for dependable secondary ignition service. The copper core helps transfer heat efficiently while supporting stable spark delivery, and the nickel electrode materials provide a durable firing surface for routine maintenance intervals. This plug is specified with a non-removable nut terminal, flat seat, and manufacturer heat range 12.

Fitment coverage includes 1992-2002 Dodge Viper, 1986-1998 Jeep Cherokee, 1993-1998 Jeep Grand Cherokee, 1987-1995 Jeep Wrangler, 1997-1998 Jeep TJ, 1993-1997 Chrysler Concorde, 1993-1997 Chrysler Intrepid, 1994-1997 Chrysler LHS, 1994-1996 Chrysler New Yorker, 1993-1997 Dodge Intrepid, 1997 Plymouth Prowler, 1986-1992 Jeep Comanche, and 1986-1987 Jeep Wagoneer. This part cross-references NGK 4412 and Autolite 985 for the same application.

What It Helps Address

• Misfires caused by worn or fouled spark plugs
• Hard starting from weak ignition output
• Rough idle and inconsistent combustion
• Reduced throttle response from degraded spark delivery
• Service intervals on OE-style ignition tune-ups

Installation Notes and Tips

Verify the plug type RC12LYC, thread diameter, reach, seat style, and 0.035 in gap before installation. Confirm the vehicle’s ignition specification against the application listing for your Chrysler, Dodge, Jeep, or Plymouth model. Use proper spark plug service procedures and torque to the manufacturer’s specification for the engine.

Quality Assurance

Champion Copper Plus is a recognized spark plug line focused on OE-style service parts with copper-core construction for controlled heat transfer and conductivity. The 412 spark plug is built to match listed factory applications and ignition requirements.