PROFORM Wedge-Locking Header Bolts ELIMINATE the need to constantly re-tighten collector bolts, and without the need for clips, pins, racing-wire, chemicals or gunk. The secret is in the Wedge-Locking Washer's super-hardened external teeth that "bite" into the bottom of the bolt head and the top flange surface. Vibrations that normally cause other bolts to loosen, are blocked by the wedge-locking action that uses tension, instead of friction to stay snug. In fact, contact with oil actually facilitates the effect. Installs/uninstalls with a normal wrench, lubricate, and then reuse. Each set comes with twelve Hex Head, Grade 8 (12.9) steel bolts (3/8"-16 thread, 1" long) with a black oxide finish, and pre-assembled Wedge-Locking Washers.

Features:
Grade 8 (12.9) Steel
  • Hex Head Type
  • 1-inch Length
  • Fits GM V6, SB 265-400, Buick, Olds, Pontiac '79 and earlier, Mopar BB 383-440 exc 413, AMC V8's w 3/8" bolts
  • PROFORM Parts Brand Product
  • Sold as Set of 12
  • 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