Restore reliable ignition and smooth engine performance with an OEM ACDelco copper core spark plug engineered for consistent firing and factory-correct operation in your Corvette.

This Corvette ACDelco Professional conventional spark plug is a correct-fit OEM replacement for 1986-1987 Corvette applications. It features a copper core center electrode that delivers excellent heat transfer and dependable ignition performance.

Nickel alloy electrode tips resist wear and spark erosion, while the resistor design helps reduce electrical interference for smooth operation. Using the correct heat range and plug design is essential for proper combustion, throttle response, and engine longevity.

Built to OEM specifications, this ACDelco spark plug is ideal for routine maintenance, tune-ups, or restoring factory-correct ignition components.

Fits the Following Corvette Models:
C4 Coupes and Convertibles: 1986, 1987.

Features / Benefits:

• OEM ACDelco Professional spark plug for Corvette ignition systems

• Fits 1986-1987 C4 Corvette models

• Conventional copper core design for efficient heat transfer

• Nickel alloy electrode tips resist wear and spark erosion

• Resistor-style plug helps reduce electrical interference

• Correct gasket seat and heat range for factory performance

• GM reference part number not provided

• ACDelco Professional part number: 41-629

Material / Finish:
Copper core center electrode with nickel alloy tip and nickel ground electrode for durability and consistent ignition.

Dimensions:
Thread size: 14 mm (M14 x 1.25)
Reach: 0.75 in (19 mm)
Hex size: 5/8 in (15.88 mm / 16 mm)
Pre-gap: 0.035 in (0.89 mm)

Because Details Matter
Spark plugs are critical to engine performance, efficiency, and reliability. Using the correct OEM ACDelco plug ensures proper combustion and factory-designed ignition characteristics. Attention to details like this keeps your Corvette running smooth, responsive, and dependable.