Champion 58 Spark Plug

Champion Copper Plus 58 Spark Plug

Champion Copper Plus 58 is an OE-style spark plug built for dependable ignition performance in classic GM and Chrysler applications. It uses a copper core electrode for improved conductivity and heat control, with nickel center and ground electrode materials for steady wear characteristics.

For buyers searching for a Champion 58 spark plug for Pontiac GTO, Chevrolet Nova, or Chrysler Newport applications, this RJ18YC plug matches the listed gap, reach, and seat specifications used in many original-equipment setups.

Key Features

• Copper core electrode for strong conductivity and heat management
• Nickel center electrode tip and nickel copper alloy ground electrode
• Pre-gapped at 0.035 in / 0.90 mm
• Resistor type spark plug for ignition system noise control
• Flat seat design with 0.375 in reach and 14 mm thread diameter
• Champion Copper Plus classification for OE-style service replacement
• Part number 58, plug type RJ18YC

Product Details

Champion Copper Plus 58 is a secondary ignition spark plug engineered around a copper core design that supports conductivity and heat transfer. The nickel-based electrode construction helps maintain consistent firing characteristics, while the 0.035-inch pre-gap supports straightforward installation in applications that call for RJ18YC specifications. This part cross-references Autolite 86 and NGK 1482 for the same application.

Compatible With 1951-1953 Chrysler Imperial, N/A; 1951-1953 Chrysler New Yorker, N/A; 1951-1953 Chrysler Newport, N/A; 1951-1953 Chrysler Town & Country, N/A; 1955 Chrysler Newport, N/A; 1955 Chrysler Town & Country, N/A; 1967 Buick Skylark, N/A; 1967 Cadillac DeVille, N/A; 1967 Cadillac Eldorado, N/A; 1967 Cadillac Fleetwood, N/A; 1967 Oldsmobile Toronado, N/A; 1967-1968 Oldsmobile Cutlass Supreme, N/A; 1967-1968 Oldsmobile Delta 88, N/A; 1968 Oldsmobile Cutlass, N/A; 1968 Chevrolet Bel Air, N/A; 1968-1970 Pontiac Tempest, N/A; 1969 Chevrolet Impala, N/A; 1969-1970 Chevrolet Blazer, N/A; 1969-1970 Chevrolet C10 Suburban, N/A; 1969-1970 Chevrolet C20 Suburban, N/A; 1969-1970 Chevrolet El Camino, N/A; 1969-1970 Chevrolet K10 Suburban, N/A; 1969-1970 Chevrolet K20 Suburban, N/A; 1969-1970 Chevrolet Nova, N/A; 1967-1971 Pontiac Acadian, N/A; 1967-1971 Pontiac Bonneville, N/A; 1967-1971 Pontiac GTO, N/A; 1967-1971 Pontiac Laurentian, N/A; 1967-1971 Pontiac Parisienne, N/A; 1970 Pontiac Laurentian, N/A; 1970 Pontiac Parisienne, N/A.

Common Uses

• Restoring weak or inconsistent spark in older ignition systems
• Replacing worn plugs that no longer hold the specified gap
• Addressing rough idle caused by aged secondary ignition components
• Supporting proper combustion in OE-style classic vehicle tune-ups
• Refreshing ignition service on Pontiac GTO, Chevrolet Nova, and Chrysler Newport applications

Installation Notes

Verify the plug type RJ18YC, 14 mm thread diameter, 0.375 in reach, and flat seat before installation. Confirm the specified gap for the engine application; this plug is pre-gapped at 0.035 in / 0.90 mm, but final adjustment should match the vehicle service specification. Use the correct hex size and tighten to the manufacturer’s torque specification for the cylinder head material.

Quality Assurance

Champion Copper Plus plugs are built for dependable service in OE-style ignition applications. The copper core design and nickel electrode materials support stable conductivity and controlled heat transfer for consistent operation in classic vehicle maintenance.