Autolite 8 Pack of Genuine OEM Racing Spark Plugs - AR3910X-8PK

Genuine Autolite replacement part. Thread Size: 14mm, Thread Pitch: 1.25mm, Seat Type: Gasket, Reach: 19mm (3/4"). Hex Size: 5/8" (16mm), Terminal Type: Solid. Cut Back Ground Electrode Providing Improved Ignitablility. New Yttrium-Enhanced Alloy Enables up to 8% Reduction in Sidewire Temperature.