Proform Wedge-Locking Header Bolts LS Engines with 1/4" Header Flange in 8mm x .984" Long, Nickel Plated Finish
778-66754
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Specifications:
Proform's Wedge-Locking grade 8 header bolts are designed to keep the bolts from backing out by using a pair of permanently attached special washers.
So, How Do They Work? 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. These high quality bolts are sold in complete sets (Enough bolts for both headers).
Motor Vehicles
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Tools:
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Electrical Cords
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