Champion 58 Spark Plug

Reliable Ignition with Champion Copper Plus Spark Plug 58

The Champion Copper Plus Spark Plug 58 is engineered to deliver consistent ignition performance for a range of classic and modern vehicles. Designed with durable nickel and copper alloy components, this spark plug supports efficient combustion and reliable engine starts.

• Ground electrode core made of nickel for durability
• Nickel center electrode tip for stable spark delivery
• Pre-set gap size of 0.035 inches for optimal ignition
• Flat seat type ensuring proper fit and seal
• Resistor type spark plug to reduce electrical interference
• Thread diameter of 14 mm (0.551 inch) with 0.375 inch reach
• Hex size of 13/16 inch (0.813 inch) for easy installation
• Manufacturer heat range 18 suitable for a variety of engine conditions

About the Champion Copper Plus Product Line

The Copper Plus line from Champion focuses on spark plugs that combine copper cores with nickel alloy electrodes to provide reliable ignition and consistent performance. This line is designed to meet the ignition needs of many domestic vehicles, offering a balance of durability and efficient spark conduction. The Copper Plus 58 spark plug is part of this line, providing a trusted ignition solution for vehicles requiring a heat range 18 plug with a flat seat and resistor design.

Technical Details and Compatibility

The Champion Copper Plus 58 spark plug features a single ground electrode made from a nickel copper alloy, paired with a nickel center electrode tip. It has a pre-gap size of 0.035 inches (0.90 mm) and an insulator height of 0.09 inches, ensuring proper spark gap and insulation. The plug type is RJ18YC with a taper diameter of 0.31 inches, thread diameter of 14 mm, and a reach of 0.375 inches. Its flat seat design and resistor type help maintain engine performance and reduce radio frequency interference.

Compatible Vehicles

This spark plug is compatible with a variety of GM and Chrysler vehicles, including Buick, Cadillac, Chevrolet, Chrysler, Oldsmobile, and Pontiac models. Specific models include Acadian, Bel Air, Blazer, Bonneville, C10 Suburban, C20 Suburban, Cutlass, Cutlass Supreme, Delta 88, DeVille, El Camino, Eldorado, Fleetwood, GTO, Impala, Imperial, K10 Suburban, K20 Suburban, Laurentian, Newport, New Yorker, Nova, Parisienne, Skylark, Tempest, Toronado, and Town & Country.

Common Applications and Issues Addressed

• Improves ignition reliability in older GM and Chrysler vehicles
• Helps reduce misfires caused by worn or damaged spark plugs
• Supports consistent engine starts and smooth idling
• Reduces electrical interference with onboard electronics
• Maintains proper combustion efficiency for fuel economy

Installation Notes and Tips

• Verify the correct spark plug gap of 0.035 inches before installation
• Use a 13/16 inch (0.813 inch) hex socket for proper torque application
• Ensure the flat seat matches the engine’s cylinder head design
• Apply anti-seize compound sparingly on threads if recommended by the vehicle manufacturer
• Torque to manufacturer specifications to avoid damage or improper sealing

Quality Assurance and Warranty

Champion Copper Plus spark plugs are manufactured to meet OEM specifications for fit, form, and function. The use of nickel and copper alloy materials ensures durability and consistent performance. While specific warranty details may vary, Champion products typically come with a limited warranty against manufacturing defects. Always consult product documentation or the vehicle manufacturer for warranty coverage and installation guidelines.