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.
- Copper core center electrode: aids thermal control and improves resistance to fouling.
- High nickel alloy center and ground electrode: engineered for extended life.
- High alumina multi-rib ceramic insulator: provides thermal conductivity and superior insulation for added strength.
- Nickel-plated shell: corrosion resistant for increased durability over extended periods.
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:
Frequently Asked Questions
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.
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