Champion 340 Spark Plug

Champion Copper Plus 340 Spark Plug

Champion Copper Plus 340 is a resistor spark plug built for dependable ignition performance and stable heat control. Its copper core electrode improves conductivity, while the nickel center and ground electrode materials support consistent wear characteristics for everyday driving.

Key Features

• Copper core electrode for improved conductivity and heat management
• Nickel center electrode tip and nickel copper alloy ground electrode
• Resistor design for reduced electrical noise
• Pre-gapped at 0.035 in. with a flat seat design
• 14 mm thread diameter, 0.75 in. reach, and 5/8 in. hex size
• Champion Copper Plus classification, part number 340

Product Details

This Champion spark plug is part of the Copper Plus line, a product family focused on practical ignition service with copper-core construction for conductivity and heat control. The RC7YC plug type, removable nut terminal, and 7 heat range make it a direct-fit service part for a range of import and domestic applications, including Honda Civic, Honda S2000, Acura CSX, Aston Martin V8 Vantage, and Saab models listed below. Part number 340 is also referenced for applications that call for RC7YC-style fitment.

This part cross-references Atlantic Automotive Engineering 3922 for the same application.

Vehicle Fitment

• Fits 2006-2017 Aston Martin V8 Vantage, N/A; Gap 0.038 in.; Plug Type Number RC7YC; Copper Plus
• Fits 2006-2011 Honda Civic, N/A; Gap 0.044 in.; Plug Type Number RC7YC; Copper Plus
• Fits 2007-2010 Acura CSX, N/A; Gap 0.044 in.; Plug Type Number RC7YC; Copper Plus
• Fits 2000-2009 Honda S2000, N/A; Gap 0.044 in.; Plug Type Number RC7YC; Copper Plus
• Fits 2005-2007 Dodge Dakota, N/A; Gap 0.040 in.; Plug Type Number RC7YC; Copper Plus
• Fits 2003-2006 Porsche Cayenne, N/A; Gap 0.032 in.; Plug Type Number RC7YC; Copper Plus
• Fits 2002-2004 Jeep Grand Cherokee, N/A; Gap 0.040 in.; Plug Type Number RC7YC; Copper Plus
• Fits 1999-2003 Saab 9-5, N/A; OE Type; Gap 0.039 in.; Plug Type Number RC7YC; Copper Plus
• Fits 1997-1998 Saab 900, N/A; OE Type; Gap 0.040 in.; Plug Type Number RC7YC; Copper Plus
• Fits 1990-1998 Saab 9000, N/A; OE Type; Gap 0.039 in.; Plug Type Number RC7YC; Copper Plus
• Fits 1995-1996 Saab 900, N/A; OE Type; Gap 0.044 in.; Plug Type Number RC7YC; Copper Plus
• Fits 1990 Saab 9000, N/A; Gap 0.028 in.; Plug Type Number RC7YC; Copper Plus
• Fits 1989 Saab 900, N/A; OE Type; Gap 0.028 in.; Plug Type Number RC7YC; Copper Plus
• Fits 1986-1987 Saab 900, N/A; OE Type; Gap 0.028 in.; Plug Type Number RC7YC; Copper Plus
• Fits 1986-1988 Saab 9000, N/A; OE Type; Gap 0.028 in.; Plug Type Number RC7YC; Copper Plus

Common Uses

• Restoring ignition performance on vehicles with worn spark plugs
• Addressing rough idle caused by plug wear or incorrect gap
• Helping correct misfire conditions related to aged secondary ignition components
• Replacing an RC7YC-style plug during scheduled tune-up service
• Maintaining consistent spark delivery in Honda Civic and Honda S2000 applications

Installation Notes

Verify the required plug type, thread diameter, reach, seat type, and gap before installation. The pre-gap is listed at 0.035 in., but several listed vehicles call for application-specific gap settings, so confirm the engine specification for your exact model year. Use the removable nut terminal only as required by the ignition lead or coil-on-plug setup, and torque to the vehicle manufacturer’s specification.

Quality Assurance

Champion Copper Plus plugs are built around a copper-core design for conductivity and heat control, with nickel-based electrode materials for steady service life. Part number 340 is specified for RC7YC applications and follows the fitment data provided for the listed vehicles.