Wedge-Locking Header Bolts Hex Head 3/8 Diameter X 3/4 Inch Blk Oxide 16 Pcs Proform 000LB Capacity 1 Made from High-Quality Chrome Moly

Made from High-Quality Chrome Moly Steel

No-Mess Funnel In-Store Merchandiser

On-Head Model

Fits 1965 to 1990 396-454 Big Block Chevy Engines

One Fits AN Fitting Sizes -3AN Through -8AN

Wedge-Locking Header Bolts Hex Head 3/8 Diameter X 3/4 Inch Blk Oxide 16 Pcs Proform 000LB Capacity 1 Made from High-Quality Chrome MolyEach 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