Wedge-Locking Header Bolts – Proform (66751)

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 twelve 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.
Engine Header Bolts
Wedge-Locking Technology
Hex Head Type
3/8-16 Thread X 3/4 Inch Long
Black Oxide Finish
12 Pcs in kit
Fits GM V6, SB 265-400, Buick, Olds, Pontiac ’79 and earlier, Mopar BB 383-440 exc 413, AMC V8’s w 3/8″ bolts
Header Bolts
Hex Head
3/8-16 X 3/4L
Exhaust Header Bolt
Wedge-Locking Header Bolts
Hex Head
3/8 dia. X 3/4in Black Oxide
12 Pcs

Specifications

Vehicle Fitment