Wedge-Locking Header Bolts Hex Head 3/8 Diameter X 1 Inch Black Oxide 12 Pcs Proform Telescoping Gauge Tool This Harness Kit Replaces The

This Harness Kit Replaces The Module To Wiring Harness On Chevrolet HEI Distributors

Features include a 100-12

7/16-20 Thread

Sold as One Pair

Billet Aluminum

Wedge-Locking Header Bolts Hex Head 3/8 Diameter X 1 Inch Black Oxide 12 Pcs Proform Telescoping Gauge Tool This Harness Kit Replaces TheEach PROFORM Grade 8 Header Bolt is permanently assembled with a pair of special washers. When the bolt is torqued to 28+ ft lbs, the washers super hardened external teeth bite into and grip the bottom of the bolt head and the top surface of the header. After being self locked in this manner, any bolt loosening rotation is blocked by a wedge locking action created by the washers interfacing, matching cams. Its an uphill climb: vibration that might