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 , Extended T-Bar Style Nuts , Wide Ends for Load-Distribution/Vacuum Leak Protection

    Proform , Extended T-Bar Style Nuts , Wide Ends for Load-Distribution/Vacuum Leak Protection

    $22.94

    Proform , Radiator System, Slim-Fit, Fits 1964-66 Mustang, Passenger Side Outlet, Automatic Transmission

    Proform , Radiator System, Slim-Fit, Fits 1964-66 Mustang, Passenger Side Outlet, Automatic Transmission

    $1,775.85

    Proform , Electric Piston Ring Filer , 120 Volt Model

    Proform , Electric Piston Ring Filer , 120 Volt Model

    $460.07

    Proform , LS Valve Spring Compressor Tool , Fits LS1, LS2 and LS6 Cylinder Heads

    Proform , LS Valve Spring Compressor Tool , Fits LS1, LS2 and LS6 Cylinder Heads

    $163.54

    Proform , Chrysler Distributor Conversion Kit; Black Cap, Fits Chrysler 413-426-426W-440 V8 Engines

    Proform , Chrysler Distributor Conversion Kit; Black Cap, Fits Chrysler 413-426-426W-440 V8 Engines

    $335.31