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Price: $32.78
Proform Header Bolt Kit 66755; Self-Locking M8 x 1.25 for Chevy LS-Series
Exhaust Header Bolt Kit Model or Series: Self-Locking
Make: Chevy
Engine: LS
Thread Size: M8 x 1.25
Bolt UHL: 30mm (1.181")
Head Style: Hex Head
Material: Steel
Includes Washers: Yes
Finish: Nickel Plated
Quantity: Sold as Set (12pcs)
- Engine Header Bolts
- Wedge-Locking Technology
- Hex Head Type
- 8mm x 1.25 x 1.181Inch Long
- Shiny Nickel Plated Finish
- 12 Pcs in kit
- Fits GM LS Engines With 3/8 Inch Wide Flange
- Sold As A Set
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.
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