Proform 66755 - Wedge Locking Header Bolts LS 8mm x 1.18in
Proform 66755
*some restrictions apply
- Part Number:
- 66755
- SKU:
- BCHW-66755
- UPC:
- 037995667550
- Availability:
- IN STOCK AND READY TO SHIP
Proform - 66755
Header Bolt - Locking - 8 mm x 1.25 Thread - 1.181 in Long - Hex Head - Steel - Nickel Plated - GM LS-Series - Set of 12
Fits GM LS Engines with 3/8" Wide Flange
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.
