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66754 - Wedge-Locking LS Header Bolts, .984"L x 8mm, 12 bolts

Availability: Special Order Item
Pricing: $24.95


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. 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.


  • 66754
  • 66754
  • 037995667543
  • Proform
  • Special Order Item
  • New

Shipping Information

  • Item Requires Shipping
  • 0.7 lbs.
  • W4.5000” x H1.7500” x L6.7500”

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