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
  • 1.181-inch Length
  • Fits GM LS Engines with 3/8-inch Wide Flange
  • PROFORM Parts Brand Product
  • Sold as Set of 12
  • More From This Category

    ARP Alternator Bracket Bolts, Stainless Steel, Polished, 12-Point, For Chevrolet Small/Big Block, Set

    ARP Alternator Bracket Bolts, Stainless Steel, Polished, 12-Point, For Chevrolet Small/Big Block, Set

    $21.12

    MANLEY Piston, Turbo Tuff, 1.209 in. Compression Distance, 99.55 mm Bore Size, -17cc Dish, For Subaru, Set of 4

    MANLEY Piston, Turbo Tuff, 1.209 in. Compression Distance, 99.55 mm Bore Size, -17cc Dish, For Subaru, Set of 4

    $1,559.44

    Wilwood Rotor, 1.25 Width, 11.75 in. Dia, 8 x 7.00 in. Bolt Circle, Iron, 32 V, Plain Face, Plain, Each

    Wilwood Rotor, 1.25 Width, 11.75 in. Dia, 8 x 7.00 in. Bolt Circle, Iron, 32 V, Plain Face, Plain, Each

    $80.66

    Camshaft

    Camshaft

    $158.65

    COMP Cams Cam/Lifters/Timing, Xtreme Energy, Hydraulic Flat Cam, Advertised Duration 268/280, Lift .509/.512, For Ford 221-302

    COMP Cams Cam/Lifters/Timing, Xtreme Energy, Hydraulic Flat Cam, Advertised Duration 268/280, Lift .509/.512, For Ford 221-302

    $814.46

    DBA Front Xtreme Performance Brake Pads, For Holden HSV Harrop 4 Piston VT-VX, Kit

    DBA Front Xtreme Performance Brake Pads, For Holden HSV Harrop 4 Piston VT-VX, Kit

    $225.90