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. With 1,692 applications, see the Buyer's Guide tab for the full list.
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.
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 Buyer's Guide tab and order the matching count for a full set.
Does this plug fit my vehicle or equipment?
The 386 fits 1,692 listed applications, from vintage Buick engines to air compressors, balers, and ag/industrial equipment. Confirm your exact vehicle or engine in 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.
