Wedge-Locking Header Bolts Hex Head M8 X 1.18 1 Inch Chevy LS Nickel Plt 12 Pcs Proform Scale 75-to-1 sealed gear-reduction drive and

75-to-1 sealed gear-reduction drive and full ball bearing construction

0001 Inch Increments

Also Includes Electronic Control Unit Box

Engine Ignition Module

Wedge-Locking Header Bolts Hex Head M8 X 1.18 1 Inch Chevy LS Nickel Plt 12 Pcs Proform Scale 75-to-1 sealed gear-reduction drive andEach 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