Wedge-Locking Header Bolts – Proform (66756)

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, 1″ long) with a black oxide finish, and pre-assembled Wedge-Locking Washers.
Engine Header Bolts
Wedge-Locking Technology
Hex Head Type
3/8-16 Thread X 1 Inch Long
Black Oxide Finish
16 Pcs in kit
Fits GM BB 396-502 exc 348 and 409, Ford 5.0L, SB 289-302-351W, Mopar 414
Header Bolts
Hex Head
3/8-16 X 1inL
Exhaust Header Bolt
Wedge-Locking Header Bolts
Hex Head
3/8 dia. X 1in
Blk Oxide Finish
16 Pcs

Specifications

Vehicle Fitment