Autolite Spark Plug P/N:646
Designed to deliver quick starts and the power your engine needs, the Autolite spark plug 85 is a copper-core plug with a nickel-plated shell. It is a direct-fit replacement for many vehicles, among them the 1966-1978 Dodge Charger 5.2L / 5.9L / 6.3L / 6.6L / 7.2L, 1965-1969 Chevrolet Impala 3.8L / 4.6L / 5.0L / 5.3L / 5.4L / 5.7L and 1967-1969 Chevrolet Camaro 4.9L / 5.3L / 5.4L / 5.7L. See the Buyer's Guide tab for the full list.
Specifications: M14-1.25 metric thread, 9 mm (0.374 in) reach, flat seat with a flat washer included, and 13/16 in hex. It has a manufacturer heat range of 8, mid projection, and a single ground electrode. It is a resistor type plug with a listed resistance of 4,000 ohms, a non-removable terminal nut, and a 2.46 in (62.5 mm) insulator height.
The number of plugs needed varies by application. For example, the 1967-1969 Chevrolet Camaro 4.9L / 5.3L / 5.4L / 5.7L uses eight, the listed six-cylinder engines use six, and the listed air compressor uses one. The minimum order quantity is one. Autolite backs this plug with a 2-year limited warranty. Country of origin: Mexico.
What are the thread size and reach of the Autolite 85?
It uses an M14-1.25 metric thread with a 9 mm (0.374 in) reach. It has a flat seat with a flat washer included and a 13/16 in hex.
Is the Autolite 85 a resistor spark plug?
Yes. It is a resistor type plug with a listed resistance of 4,000 ohms and a non-removable terminal nut.
How many Autolite 85 plugs does my engine need?
Quantity varies by application. For example, the 1967-1969 Chevrolet Camaro 4.9L / 5.3L / 5.4L / 5.7L uses eight, listed six-cylinder engines use six, and the listed air compressor uses one. See the Buyer's Guide tab.
What are signs a spark plug may need replacing?
Common signs include hard starting, misfires, rough idle, hesitation and reduced fuel economy. Other ignition or fuel faults can cause the same symptoms, so diagnose the cause before replacing.
What warranty comes with the Autolite 85 copper spark plug?
Autolite covers the 85 copper spark plug with a 2-year limited warranty. Country of origin: Mexico.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.