Each PROFORM Grade 8 Header Bolt is permanently assembled with a pair of special washers. When the bolt is torqued to 28+ ft-lbs, the washers super-hardened external teeth bite into and grip the bottom of the bolt head and the top surface of the header. After being self-locked in this manner, any bolt-loosening rotation is blocked by a wedge-locking action created by the washers interfacing, matching cams. Its an uphill climb: vibration that might ordinarily loosen the bolt actually increases the wedge-locking tension, securing the bolt even more. Because this simple wedge-locking method uses tension instead of friction, contact with oil actually facilitates the wedge effect. When changing headers, PROFORM Header Bolts can be untightened with a normal wrench, lubricated, and reused.

Features:
Grade 8 (12.9) Steel
  • Hex Head Type
  • 3/4-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

    COMP Cams Timing Belt, Replacement for CCA-6100 System, Each

    COMP Cams Timing Belt, Replacement for CCA-6100 System, Each

    $172.48

    DBA Front Street Series Brake Caliper, For Honda Civic ES 1.7L Petrol FWD Front L/H 2/2002 - 1/06, Kit

    DBA Front Street Series Brake Caliper, For Honda Civic ES 1.7L Petrol FWD Front L/H 2/2002 - 1/06, Kit

    $184.40

    MANLEY Valve, Titanium, Intake, Bead Loc, 2.125 in. Head Dia, 0.3415 in. Stem Dia, 5.54 in. Height, Set of 8

    MANLEY Valve, Titanium, Intake, Bead Loc, 2.125 in. Head Dia, 0.3415 in. Stem Dia, 5.54 in. Height, Set of 8

    $2,421.90

    NOS Banner, 18in. x 38in.

    NOS Banner, 18in. x 38in.

    $47.70

    Premium Piston Ring Set

    Premium Piston Ring Set

    $103.25