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

    Autometer Gauge, Air/Fuel Ratio-Pro, 2 1/16", 10:1-20:1, Digital W/ Peak & Warn, Es, Es

    Autometer Gauge, Air/Fuel Ratio-Pro, 2 1/16", 10:1-20:1, Digital W/ Peak & Warn, Es, Es

    $591.57

    Auxiliary Shaft Bearing Set

    Auxiliary Shaft Bearing Set

    $41.84

    Haltech Nexus S3 Plug 'n' Play Adapter Harness Mitsubishi EVO 9 & EVO 8MR

    Haltech Nexus S3 Plug 'n' Play Adapter Harness Mitsubishi EVO 9 & EVO 8MR

    $740.00

    MANLEY Piston Ring, 92.6mm/3.647 in. Bore Size, 1.2 x 1.5mm Width, Set of 6

    MANLEY Piston Ring, 92.6mm/3.647 in. Bore Size, 1.2 x 1.5mm Width, Set of 6

    $451.83

    Whiteline Front Axle Control Arm Lower, Inner Rear Bushing Kit-Double Offset, Nissan

    Whiteline Front Axle Control Arm Lower, Inner Rear Bushing Kit-Double Offset, Nissan

    $66.28