PROFORM Wedge Locking Header Bolts 1.181" Long Set For LS Engines With 3/8" Flange



  • Set Includes 12 Bolts
  • For LS Engines
  • Grade 8 Hardware
  • Wedge Locking Design

Set of PROFORM 1.181" Long Wedge Locking Header Bolts for LS Engines with a 3/8" Flange.

Lock your exhaust headers into place with a set of grade 8 hardware from PROFORM. Each of the 1.181" Long Wedge-Locking Header Bolts (66755) is permanently assembled with a pair of special washers. The self-locking design prevents bolt-loosening rotation; however, the bolts can be untightened normally with a wrench. The Header Bolts fit LS Engines with a 3/8" Flange.

Features and Benefits:
- Grade 8 Bolts
- 1.181 Inches Long
- Fits LS Engines with a 3/8-Inch Flange
- Sold as a Set of Twelve

How exactly does the Wedge-Locking design function? When the bolt is torqued to 28+ ft-lbs, the washer's super-hardened external teeth bite into and clench the bottom of the bolt head and the top surface of the header. Each washer's interfacing, matching cams create a wedge-locking action so the bolts won't come loose. 

Since the wedge-locking strategy uses tension instead of friction, contact with oil promotes the wedge effect. When it's time to change headers, simply loosen the bolts with a wrench, lubricate them and reuse them. 

California Residents: Proposition 65 Warning

Vehicle Fitment

This product will fit the following C10 years:

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