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Ships within 48 hours · Estimated delivery Aug 3 - Aug 8
Imagine that
Fits All GM LS Cylinder Heads With 3/8 Inch And 7/16 Rocker Studs
Fits Small And Big Block Chevy Cranks
The race-proven full needle bearing
theft-resistent clamshell packaging
Wedge-Locking Header Bolts Hex Head 3/8 Diameter X 1 Inch Blk Oxide Finish 16 Pcs Proform Multi Purpose Funnel Imagine thatEach 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
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