Wedge-Locking Header Bolts - Proform (66754)

Details

• Brand:

  

• SKU:

  66754

• GTIN: 00037995667543
• UPC: 037995667543
• Description: Each PROFORM 12.9 Steel (equiv. 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. It's 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.
  Engine Header Bolts
  Wedge-Locking Technology
  Hex Head Type
  M8 Thread X .984 Inch Long
  Shiny Nickel Plated
  12.9 Steel
  12 Pcs in kit
  Fits GM LS Engines with 1/4in Wide Flange
  Header Bolts
  Hex Head
  M8 X .984"L
  Exhaust Header Bolt
  Wedge-Locking Header Bolts
  Hex Head
  M8 X .984in
  Chevy LS
  Nickel Plt
  12 Pcs
• Condition: New

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