Wedge-Locking Header Bolts Hex Head 3/8 Diameter X 3/4 Inch Blk Oxide 16 Pcs Proform Engine Valve Cover Hold Down Tab 000 More Volts Than Stock

000 More Volts Than Stock Coil

high-torque

Tachometer Display

4 KW Motor

Engine Valve Spring Pressure Tester

Wedge-Locking Header Bolts Hex Head 3/8 Diameter X 3/4 Inch Blk Oxide 16 Pcs Proform Engine Valve Cover Hold Down Tab 000 More Volts Than StockEach 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