Autolite 664 Spark Plug

Autolite 664 Copper Resistor Spark Plug

Autolite 664 is a copper resistor spark plug built for OE-style form, fit, and function in older domestic applications. It is specified with a 0.060 in. pre-gap, tapered seat, 14 mm thread diameter, and mid-projection ceramic insulator for direct replacement service.

This Autolite Copper Resistor Spark Plug line focuses on dependable ignition performance for everyday driving. The copper core and nickel electrode materials support consistent spark delivery, while the resistor design helps reduce electrical noise in the ignition system.

Key Features

• Copper center electrode core with nickel tip material
• Nickel ground electrode with tapered tip design
• Resistor type spark plug for ignition noise control
• Pre-gapped to 0.060 in. / 1.50 mm
• 14.0 mm thread diameter with tapered seat
• 5/8 in. hex size and stud terminal type
• Ceramic insulator with mid-projection design
• OE-style replacement for select Chevrolet, GMC, Buick, Oldsmobile, and Pontiac vehicles

Detailed Description

Autolite 664 is a direct-fit spark plug for a wide range of older GM vehicles, including Chevrolet S10, Chevrolet Camaro, GMC Sonoma, Buick Century, Oldsmobile Cutlass Ciera, and Pontiac Grand Am applications listed in the fitment data. It is also cross-referenced to select equivalent part numbers for the same application, including Flosser 2248.

As part of the Autolite Copper Resistor Spark Plug line, this plug is built around a copper core for stable ignition performance and a nickel-tipped electrode design for OE-style service replacement. The tapered seat, standard regular center electrode design, and mid-projection insulator match the specifications commonly required in legacy ignition systems. Autolite 664 is a practical choice when replacing worn plugs in vehicles such as Chevrolet S10, GMC Sonoma, and Pontiac Fiero applications.

Common Issues This Part Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent spark delivery
• Reduced fuel economy related to ignition wear
• Slow throttle response during acceleration
• Ignition noise concerns in resistor-equipped systems

Installation Notes and Tips

Verify the required thread diameter, reach, seat type, and pre-gap before installation. The plug is supplied with a 0.060 in. gap specification, but final gap should always be checked against the vehicle service information and ignition system condition. Inspect plug wires, distributor components, and coil output when replacing spark plugs on older Chevrolet, GMC, Buick, Oldsmobile, and Pontiac engines.

Use the vehicle fitment list to confirm application details for 1978-1993 models, including Chevrolet S10, GMC Safari, Buick Skylark, Oldsmobile Cutlass Cruiser, and Pontiac Sunbird listings. This part number is 664.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and original equipment manufacturers, with OE-style replacement coverage for many domestic and foreign applications. The 664 spark plug is built to match the listed specifications for consistent service replacement performance.