Deliver a dependable spark and keep every cylinder firing with the Autolite Copper Spark Plug 147. It installs as a direct-fit replacement across the listed L6-4.1L applications, including the 1975 Buick Apollo, the 1970 and 1972-1974 Chevrolet Blazer, the 1975 Chevrolet C10, the 1972-1975 GMC Sprint, and the 1972-1975 Pontiac Firebird — see the Buyer's Guide tab for the full list of GM cars, trucks, and vans.
- Copper core center electrode: aids thermal control and improves resistance to fouling.
- High nickel alloy electrodes: the specially engineered center and ground electrode are designed for extended life.
- High-alumina multi-rib ceramic insulator: provides thermal conductivity and strong insulation for added strength.
- Nickel-plated shell: corrosion resistant for increased durability.
Built to standard center-electrode design with short projection and nickel electrode tips. Specs: tapered seat, 5/8 in hex, M14 - 1.25 metric thread, 14 mm thread diameter, manufacturer heat range 6, pre-gap 0.034 in (0.9 mm), and a 5000-ohm resistor. Washers are not included. If worn plugs are behind rough idle, hard starting, or misfires, replacing them with this plug restores fresh electrodes for the listed engines. Quantity used varies by application — many listed engines take 6 — so order the count your engine requires. Country of origin: China. Backed by a 2-year limited warranty.
Interchange: R46T · R46T6 · R46TX · HR6B · 35 · RV12C · RV12C6 · 8129853 · 5613324 · AFF8-6 · AFF86 · ARF8 · ARF8-6 · ARF86 · ASF8 · ASF8-6 · ASF86 · ASF8C
Manufacturer part number 147
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What vehicles does the Autolite 147 fit?
It's a direct-fit replacement for many listed L6-4.1L applications, such as the 1975 Buick Apollo, 1970 and 1972-1974 Chevrolet Blazer, and 1972-1975 Pontiac Firebird. See the Buyer's Guide tab for the full list.
How many spark plugs do I need?
Quantity varies by application; many listed engines use 6. Minimum order quantity is 1, so order the count your specific engine requires.
Is the Autolite 147 a resistor spark plug?
Yes. It is a resistor-type plug with a rated resistance of 5000 ohm.
What is the pre-set gap and thread size?
It ships with a pre-gap of 0.034 in (0.9 mm) and uses an M14 - 1.25 metric thread with a 14 mm thread diameter and 5/8 in hex. Verify the gap specified for your engine before installing.
Does it use a tapered or gasket seat, and are washers included?
It has a tapered seat, and washers are not included.
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