Each 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 ordinarily loosen the bolt actually increases the wedge-locking tension, securing the bolt even more. Because this simple wedge-locking method uses tension instead of friction, contact with oil actually facilitates the wedge effect. When changing headers, PROFORM Header Bolts can be untightened with a normal wrench, lubricated, and reused.

Features:
Grade 8 (12.9) Steel
  • Hex Head Type
  • 1.181-inch Length
  • Fits Select Ford 16 Bolt 8mm Diameter Applications
  • PROFORM Parts Brand Product
  • Sold as Set of 16
  • More From This Category

    Proform , PROFORM Race Series 850 CFM Carburetor, Gas, Drag Racing Model

    Proform , PROFORM Race Series 850 CFM Carburetor, Gas, Drag Racing Model

    $1,492.55

    Proform , Super-Street Chevy Self-Aligning Roller Rockers, 1.6 Ratio; 3/8" Stud

    Proform , Super-Street Chevy Self-Aligning Roller Rockers, 1.6 Ratio; 3/8" Stud

    $556.89

    Proform , Radiator System, Slim-Fit, Inlet on Passenger Side, Outlet on Driver Side, 21" Core; Single Pass; Manual Transmission

    Proform , Radiator System, Slim-Fit, Inlet on Passenger Side, Outlet on Driver Side, 21" Core; Single Pass; Manual Transmission

    $1,731.45

    Proform , AMC Front Timing Cover , Die-Cast; Optimizes OEM Design; w/ Crankshaft Oil Seal

    Proform , AMC Front Timing Cover , Die-Cast; Optimizes OEM Design; w/ Crankshaft Oil Seal

    $441.07