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 Piston, 1.065 in. Compression Distance, 4.005 in. Bore Size, -31cc Dish, For Chevrolet LS, Set of 8

    MANLEY Piston, 1.065 in. Compression Distance, 4.005 in. Bore Size, -31cc Dish, For Chevrolet LS, Set of 8

    $1,892.22

    Nitto Stoker Kit for Nissan SR20 2.2L (I-Beam Rods/87mm Bore) - EN40B

    Nitto Stoker Kit for Nissan SR20 2.2L (I-Beam Rods/87mm Bore) - EN40B

    $6,935.00

    Crow Cams Camshaft, Holden V8 304/355 Carby Hydraulic Roller, Adv. Duration 303/307, Valve Lift 0.568/0.568

    Crow Cams Camshaft, Holden V8 304/355 Carby Hydraulic Roller, Adv. Duration 303/307, Valve Lift 0.568/0.568

    $997.16

    MANLEY Piston, Coated, Extreme Duty, 1.115 in. Compression Distance, 3.785 in. Bore Size, -7cc Dish, Coated, For Chevrolet 5.3L, Each

    MANLEY Piston, Coated, Extreme Duty, 1.115 in. Compression Distance, 3.785 in. Bore Size, -7cc Dish, Coated, For Chevrolet 5.3L, Each

    $298.95

    Premium Piston Ring Set

    Premium Piston Ring Set

    $175.68