Autolite 85 Spark Plug

Autolite 85 Copper Resistor Spark Plug

Autolite 85 is a copper resistor spark plug built for OE-style form, fit, and function across a wide range of classic Chrysler, Dodge, Chevrolet, Pontiac, Oldsmobile, Buick, Cadillac, Jeep, GMC, and Toyota applications. It is a practical choice for drivers restoring factory ignition performance, improving cold starts, and maintaining smooth throttle response.

Key Features

• Copper center electrode core for reliable ignition performance
• Nickel center and ground electrode tip materials
• 4,000 ohm resistor design to help control electrical noise
• Mid-projection ceramic insulator for OE-style fitment
• Flat seat design with 14.0 mm thread diameter
• 0.374 in. reach, 13/16 in. hex size, and removable nut terminal
• Pre-gapped at 0.034 in. / 0.90 mm

Product Details

The Autolite Copper Resistor Spark Plug line is positioned as an OE-style replacement for many domestic and import vehicles, including classic Chrysler New Yorker, Dodge Charger, and Chevrolet Corvette applications. Part number 85 uses a standard copper core for dependable spark delivery and a resistor design that supports ignition system noise suppression. For buyers searching for an Autolite 85 spark plug, this part matches common factory-style specifications used in older carbureted and early electronic ignition systems.

This part cross-references Champion Spark Plug 10 and Anchor 3036 for the same application.

Common Issues This Part Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent spark delivery
• Reduced throttle response during acceleration
• Ignition noise in resistor-equipped systems
• Maintenance replacement for OE-style tune-ups

Installation Notes and Fitment Tips

Compatible With many 1950s through 1970s vehicles, including Fits 1977-1978 Chrysler New Yorker, N/A; Fits 1966-1978 Dodge Charger, N/A; and Fits 1962-1970 Chevrolet Corvette, N/A. Additional fitment includes Fits 1969-1970 Pontiac GTO, N/A and Fits 1960-1974 Toyota Land Cruiser, N/A. Verify thread reach, seat type, and gap specification against the vehicle service manual before installation. The listed pre-gap is 0.034 in., while some applications in the fitment data call for a different gap setting.

Quality Assurance

Autolite manufactures ignition products for the automotive aftermarket and original equipment channels, with OE form, fit, and function as a core product standard. Part number 85 is built to meet the dimensional and electrical requirements commonly used in classic vehicle ignition service.