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 Rotating Assembly, 4.250 in. Stroke, 4.560 in. Bore Size, 6.385 in. Rod Length, +43cc Dome, BBC 555, Kit

    MANLEY Rotating Assembly, 4.250 in. Stroke, 4.560 in. Bore Size, 6.385 in. Rod Length, +43cc Dome, BBC 555, Kit

    $6,982.47

    NOS Nos Progressive N2O Controller V2

    NOS Nos Progressive N2O Controller V2

    $577.41

    Strange ,Disc Brakes, Rear, 65-73 Mopar, using H1147 Ends, Hard Pads, 1 Piece Rotor, Kit

    Strange ,Disc Brakes, Rear, 65-73 Mopar, using H1147 Ends, Hard Pads, 1 Piece Rotor, Kit

    $1,860.38