Fire up quick starts and steady spark with the Autolite Spark Plug 386, a copper-core plug engineered to help deliver the ignition your engine or equipment needs to meet performance expectations. It's a direct-fit replacement across a very wide range of listed applications — vintage cars like the 1934-1935 Buick Series 40 [L8-3.8L] and 1930 Buick Series 50 [L6-5.4L], plus air compressors, balers, and ag/industrial equipment. It fits many applications, so see the "Vehicles it fits" section for the full list.
- Copper core center electrode: aids thermal control and improves resistance to fouling.
- High-nickel alloy electrodes: specially engineered center and ground electrodes 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.
Specs: 7/8 in hex, flat seat with an included flat washer, M18-1.5 (18 mm) thread, heat range 6, 5,000-ohm resistor type, short projection, and a 2.401 in (61 mm) insulator height. Backed by a 2-year limited warranty. Quantity varies by application, so confirm how many your engine uses; sold as stated in the listing. Country of origin: China.
Product information is for general reference and may contain errors. See our Disclaimer.
Frequently Asked Questions
Is the Autolite 386 a copper spark plug?
Yes. The 386 uses a copper-core center electrode, which aids thermal control and improves resistance to fouling, paired with high-nickel alloy center and ground electrodes designed for extended life.
What are the thread and seat specs?
It has an M18-1.5 (18 mm) metric thread, a flat seat with an included flat washer, and a 7/8 in hex. Heat range is 6 and it is a resistor-type plug rated at 5,000 ohms.
Is the Autolite 386 a resistor plug?
Yes, it is a resistor-type spark plug rated at 5,000 ohms, which helps suppress radio-frequency interference.
How many spark plugs do I need?
Quantity varies by application — some engines use one and others use six or eight. Check your engine in the "Vehicles it fits" section and order the matching count for a full set.
Does this plug fit my vehicle or equipment?
The 386 fits many listed applications, from vintage Buick engines to air compressors, balers, and ag/industrial equipment. Confirm your exact vehicle or engine in the "Vehicles it fits" section before ordering.
