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Proform Wedge-Locking Header Bolts

Item #: PFM66825

Price: $36.99

Quantity:

PRODUCT DESCRIPTION

Fits: Mopar 413

Nickel Plated Finish; 3/8"-16 Thread Diameter, 1" Long

Features:

Grade 8 Steel

Hex Head Type

1-inch Length

Fits Select 16 Bolt 3/8" Diameter Applications

Sold as Set of 16

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.