Champion 823 Spark Plug

Champion Copper Plus 823 Spark Plug Overview

Champion Copper Plus 823 is a J-gap spark plug built for dependable ignition performance in a range of classic Chevrolet, GMC, Buick, and Pontiac applications. Its copper core electrode improves conductivity and heat control, while the nickel center and ground electrode materials support steady wear characteristics for everyday engine operation.

Use Champion 823 when you need a direct-fit spark plug for older vehicles that call for a non-resistor, flat-seat plug with a 0.035-inch gap specification in OE-style applications such as the Chevrolet Camaro, El Camino, and Corvette.

Key Features

• Copper core electrode for improved conductivity and heat management
• J-gap design with nickel center electrode and nickel copper alloy ground electrode
• Non-resistor construction for applications that specify a resistor-free plug
• Flat seat design with 14 mm thread diameter and 0.375-inch reach
• Pre-gapped at 0.030 inch; application notes may call for 0.035 inch
• Removable nut terminal for common ignition wire setups
• Champion Copper Plus small engine classification and J6C plug type

Product Details

Champion Copper Plus 823 is engineered around a copper core electrode to help transfer heat efficiently and maintain consistent spark performance. The nickel center electrode and nickel-based ground electrode materials are selected for stable wear, while the flat seat and J-gap configuration match many OE-style ignition requirements. This part number 823 is listed across multiple classic vehicle applications, including 1967-1968 Chevrolet Camaro, 1964-1968 Chevrolet El Camino, 1953-1955 Chevrolet Corvette, 1954-1957 Buick Century, and 1953-1957 Buick Roadmaster.

This part cross-references Autolite 124 and Gates B43 for the same application.

What It Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from weak or inconsistent ignition output
• Misfire concerns in older non-resistor ignition systems
• Reduced throttle response from degraded spark delivery
• Heat-related plug wear in classic engine applications

Installation Notes and Fitment

Verify thread diameter, reach, seat type, and gap before installation. Champion 823 uses a 14 mm thread, 0.375-inch reach, flat seat, and removable nut terminal. Set the gap to the vehicle specification when required by the application, especially on classic Chevrolet, GMC, Buick, and Pontiac engines.

• Fits 1968 Chevrolet C10 Suburban, N/A
• Fits 1968 Chevrolet C20 Suburban, N/A
• Fits 1967-1968 Chevrolet Camaro, N/A
• Fits 1964-1968 Chevrolet El Camino, N/A
• Fits 1967-1968 Chevrolet K10 Suburban, N/A
• Fits 1967-1968 Chevrolet K20 Suburban, N/A
• Fits 1953-1955 Chevrolet Corvette, N/A
• Fits 1959-1960 Chevrolet Bel Air, N/A
• Fits 1967 GMC G15/G1500 Van, N/A
• Fits 1967 GMC G25/G2500 Van, N/A
• Fits 1954-1957 Buick Century, N/A
• Fits 1953-1957 Buick Roadmaster, N/A
• Fits 1954 Buick Skylark, N/A
• Fits 1960-1962 Pontiac Laurentian, N/A
• Fits 1960-1962 Pontiac Parisienne, N/A

Quality Assurance

Champion Copper Plus 823 is built to Champion’s established spark plug specifications and backed by the brand’s long-standing ignition component expertise. The copper core design, non-resistor format, and OE-style dimensions support consistent part selection for restoration and maintenance work.