Wedge-Locking Header Bolts Hex Head 3/8 Diameter X 3/4 Inch Blk Oxide 16 Pcs Proform 000LB Capacity 1 And One Wrench Fits AN

And One Wrench Fits AN Fitting Sizes -10AN Through -20AN

One Shaft Only

On-Head Model

Not Designed To Work On Engines With A Knock Sensor

Wedge-Locking Header Bolts Hex Head 3/8 Diameter X 3/4 Inch Blk Oxide 16 Pcs Proform 000LB Capacity 1 And One Wrench Fits ANEach 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