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Wedge-Locking Header Bolts 3/4"L x 3/8"; 16 Bolts | #66823

Wedge-Locking Header Bolts 3/4"L x 3/8"; 16 Bolts | #66823

Wedge-Locking Header Bolts 3/4"L x 3/8"; 16 Bolts | #66823

$39.95
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SKU:
66823
Fitment:
Fits GM BB 396-502 exc 348 and 409, Ford 5.0L, SB 289-302-351W, Mopar 413

Wedge-Locking Header Bolts 3/4"L x 3/8"; 16 Bolts

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.

Features:
  • Grade 8 Steel
  • Hex Head Type
  • 3/4-inch Length
  • Fits Select 16 Bolt 3/8" Diameter Applications
  • PROFORM Parts Brand Product
  • Sold as One Set of 16 Pieces
Proform warrants its new products to be free from defects in material and workmanship under normal use and if properly installed for a period of 12 months from the date of purchase. Products used in racing applications or products that have been physically or mechanically altered, improperly installed or maintained, or used in improper applications are not covered under this warranty.