Wedge-Locking 
Header Bolts

Black Oxide Finish; 3/8"-16 Thread Diameter, 3/4" Long
Fits Select 16 Bolt 3/8" Diameter Applications
Features:
  • Grade 8 (12.9) Steel
  • Hex Head Type
  • 3/4-inch Length
  • Fits GM BB 396-502 exc 348 and 409, Ford 5.0L, SB 289-302-351W, Mopar 413
  • Sold as Set of 16
PART# 66752
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PROFORM Wedge-Locking Header Bolts ELIMINATE the need to constantly re-tighten collector bolts, and without the need for clips, pins, racing-wire, chemicals or gunk. The secret is in the Wedge-Locking Washer’s super-hardened external teeth that “bite” into the bottom of the bolt head and the top flange surface. Vibrations that normally cause other bolts to loosen, are blocked by the wedge-locking action that uses tension, instead of friction to stay snug. In fact, contact with oil actually facilitates the effect. Installs/uninstalls with a normal wrench, lubricate, and then reuse. Each set comes with sixteen Hex Head, Grade 8 (12.9) steel bolts (3/8”-16 thread, 3/4” long) with a black oxide finish, and pre-assembled Wedge-Locking Washers.

  • Wedge-Locking Technology Eliminates Constantly Re-Tightening Exhaust Collector Bolts; Blocks Bolt-Loosening Rotation caused by Vehicle Vibrations.
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