Wedge-Locking Header Bolts Hex Head 3/8 Diameter X 1 Inch Blk Oxide Finish 16 Pcs Proform Ignition Coil Cover 7 Ratio With 5/16 Inch

7 Ratio With 5/16 Inch Stud x 8 Pieces

Fits Big Block Chrysler B

live stream data feed via included USB cable to computer with free downloadable program for viewing and file exporting

and M16-20 Adapters

Wedge-Locking Header Bolts Hex Head 3/8 Diameter X 1 Inch Blk Oxide Finish 16 Pcs Proform Ignition Coil Cover 7 Ratio With 5/16 InchEach 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