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.
  • Wedge-Locking Header Bolts
  • Hex Head
  • M8 X 1.181in
  • Chevy LS
  • Nickel Plt
  • 12 Pcs
Attributes
Applications Fits GM LS Engines with 3/8-inch Wide Flange
Category Header Bolts
Color Nickel Plated
Country of Origin (Primary) TW
Emission Code Legal US
Feature/Benefit Backed by a full 30 day limited factory warranty
Finish Shiny Nickel Plated Steel
Harmonized Tariff Code (Schedule B) 7318159000
Hazardous Material Code N
Life Cycle Status Code 2
Material Steel
NAFTA Preference Criterion Code B
Part Type Header Bolts
SDR Required Flag N

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PROFORM 66755 Wedge-Locking Header Bolts Hex Head 8mm X 1.181in

Product Information

  • Brand: Proform
  • Product Number: 66755
  • $39.92