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

    MANLEY Pushrod, Swedged End, 4130 Chromoly, 3/8 in. Dia, 10.250 in. Length, .080 in. Wall, Each

    MANLEY Pushrod, Swedged End, 4130 Chromoly, 3/8 in. Dia, 10.250 in. Length, .080 in. Wall, Each

    $29.18

    MILODON Oil Return Screen Kit, For Chevrolet, Big Block, Kit

    MILODON Oil Return Screen Kit, For Chevrolet, Big Block, Kit

    $57.61

    Rostra Transmission External Repair Harness Connector w/ 13 Wires, 4L60-E Holden Commodore, Chevrolet, GM, Holden, Isuzu, 1993-1998

    Rostra Transmission External Repair Harness Connector w/ 13 Wires, 4L60-E Holden Commodore, Chevrolet, GM, Holden, Isuzu, 1993-1998

    $120.33

    Chain Tensioner

    Chain Tensioner

    $58.95