Wedge-Locking Header Bolts - Proform (66756)
Sale Price$42.60
Description : 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
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
- Return Policy
- Min. 12 Months
- Safe, Secure Checkout
Product Details
Description
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
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
Part Number (MPN)
66756
Brand
SKU
66756
UPC / GTIN
037995667567 / 00037995667567
Condition
New
Length
1 inch
Diameter
3/8-in.
Feature/Benefit
Wedge-Locking Technology Eliminates Constantly Re-Tightening Exhaust Collector Bolts; Blocks Bolt-Loosening Rotation caused by Vehicle Vibrations.
Applications
Fits GM BB 396-502 exc 348 and 409, Ford 5.0L, SB 289-302-351W, Mopar 413
Category
Header Bolts
Finish
Black Oxide
Material
Steel
Part Type
Header Bolts
| Year | Make | Model | Body & Trim | Engine & Transmission |
|---|---|---|---|---|
Vehicle #1
Year
Make
Model
Body & Trim
Engine & Transmission
Shipping Policy
Operated by RevolutionParts Inc · Effective date: 11/2025 · Last updated: 4/2026... Check out our Shipping Policy for more details.
Return Policy
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