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 Steel
  • Hex Head Type
  • 3/4-inch Length
  • Fits Select 16 Bolt 3/8" Diameter Applications
  • PROFORM Parts Brand Product
  • Sold as Set of 16
  • More From This Category

    Proform , Electric Water Pump Red Ford 289-302 Engines, Red Finish, Black Motor Cap; Die-Cast Aluminum

    Proform , Electric Water Pump Red Ford 289-302 Engines, Red Finish, Black Motor Cap; Die-Cast Aluminum

    $468.60

    Proform , Radiator System, Slim-Fit, 1967-69 Camaro/Firebird, Manual Transmission

    Proform , Radiator System, Slim-Fit, 1967-69 Camaro/Firebird, Manual Transmission

    $1,775.85

    Proform , Ford 100 AMP Alternator Black Crinkle, 1-Wire, Modified GM 10SI Case w/ Internal Regulator, V-Pully, & Ext. Fan

    Proform , Ford 100 AMP Alternator Black Crinkle, 1-Wire, Modified GM 10SI Case w/ Internal Regulator, V-Pully, & Ext. Fan

    $279.48

    Proform , Carburetor Main Body 750 CFM; Annular Boosters, Features Hi-Performance Boosters; Natural Finish

    Proform , Carburetor Main Body 750 CFM; Annular Boosters, Features Hi-Performance Boosters; Natural Finish

    $498.97

    Proform , PROFORM Circle Track 750 CFM Carburetor, Gas, Circle Track Model

    Proform , PROFORM Circle Track 750 CFM Carburetor, Gas, Circle Track Model

    $1,527.86