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

    Dakota Digital Gauge, MDX System, 1969-70 Ford Mustang, Carbon Fiber Style Face, Red Display, Custom

    Dakota Digital Gauge, MDX System, 1969-70 Ford Mustang, Carbon Fiber Style Face, Red Display, Custom

    $1,968.40

    MANLEY Piston, Coated, 4.095 in. Bore Size, 12.5cc Dish, HEMI 6.4, Each

    MANLEY Piston, Coated, 4.095 in. Bore Size, 12.5cc Dish, HEMI 6.4, Each

    $236.53

    MILODON Oil Pan, Steel, Gold Iridite, 8 qt, For Chevrolet, Small Block, Marine, LH Dipstick, Fits V-Drive, Each

    MILODON Oil Pan, Steel, Gold Iridite, 8 qt, For Chevrolet, Small Block, Marine, LH Dipstick, Fits V-Drive, Each

    $1,170.94

    Sonnax 258mm Performance Converter Kit, GM, Powerglide, Th350, Th400 Nlu, Each

    Sonnax 258mm Performance Converter Kit, GM, Powerglide, Th350, Th400 Nlu, Each

    $1,030.38