Wedge-Locking Header Bolts Hex Head 3/8 Diameter X 1 Inch Blk Oxide Finish 16 Pcs Proform Multi Purpose Funnel Fits All GM LS Cylinder

Fits All GM LS Cylinder Heads With 3/8 Inch And 7/16 Rocker Studs

Fits Small And Big Block Chevy Cranks

and delivers the cooling that can make the difference between a win and second place

Imagine that

Wedge-Locking Header Bolts Hex Head 3/8 Diameter X 1 Inch Blk Oxide Finish 16 Pcs Proform Multi Purpose Funnel Fits All GM LS CylinderEach 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