Deliver quick starts and dependable spark with the Autolite Copper Spark Plug 145. It's a direct-fit replacement across a wide range of 1970-1990 Chevrolet and GMC trucks and vans, including the Chevrolet Blazer (1972-1974), C10 (1975-1980), C20 (1975-1986), C30 (1975-1986), El Camino (1970-1974 and 1978-1979), and GMC Jimmy (1972-1981). Engines range from the L6-4.8L to the V8-5.0L, V8-5.7L, V8-6.0L, V8-6.2L, V8-6.6L, and V8-7.4L — see the Buyer's Guide tab for the full list of applications.
This is a resistor-type plug (4000 ohm) with a tapered seat, 5/8 hex, 14 mm thread (M14-1.25), short-projection center electrode, and manufacturer heat range 8. It arrives pre-gapped at 0.04 in (1 mm); washers are not included. Quantity varies by engine (the listed applications use 6 or 8 plugs) — order the number your engine requires. Backed by a 2-year limited warranty. Country of origin: Mexico.
Interchange: 566 · 44T · MR43T · MR44T · R44T · R45T · HR9AC+ · HR9AC · 121 · 7972 · RV8C · 8129827 · 5029 · T16R-U · T16RU · 22131 · 2U2J12405YA · 19157985 · 19157988 · 5613842 · 5613855 · 5613867 · 5613875 · ARF4 · ARF6 · ASF4C · SP410 · 711 · BR5FS · BR6FS · YR5 · CC014E · SF14E · SM14E. Manufacturer part number 145.
This part cross-references / interchanges with the following part numbers:
Is the Autolite 145 a resistor spark plug?
Yes. It's a resistor-type plug rated at 4000 ohm, which helps suppress ignition-related electrical noise.
What are the plug's key specifications?
Tapered seat, 5/8 hex, 14 mm thread (M14-1.25), short-projection center electrode, and manufacturer heat range 8. It's a copper-core plug with a high alumina ceramic insulator.
Does it come pre-gapped, and are washers included?
It ships pre-gapped at 0.04 in (1 mm). Washers are not included. Always verify the gap and torque against your vehicle's service information before installing.
How many plugs do I need?
Quantity varies by engine — the listed applications use 6 or 8 plugs. Check the Buyer's Guide tab for your specific engine and order that quantity; plugs are sold to that count.
Will the Autolite 145 fit my vehicle?
It's cataloged for many 1970-1990 Chevrolet and GMC trucks and vans. Confirm your exact year, model, and engine on the Buyer's Guide tab before ordering.
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.
