The wedge-locking design featured on these grade 8 bolts makes them a safe and secure choice for the exhaust headers on your application. Sold as a set of twelve, the PROFORM 1" Long Wedge Locking Header Bolts (66753) are compatible with GM V6 and Small Block 265, 283, 302, 305, 307, 327, 350 and 400 Engines.
Features and Benefits:
- 3/8”-16 thread diameter
- One-Inch Length
- Fits GM V6 and 265-400 Small Block Engines
- Sold as a Set of Twelve
How exactly does the Wedge-Locking design function? Each bolt is permanently assembled with a pair of washers. 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, exposure to oil promotes the wedge effect. When it's time to change headers, simply loosen the bolts with a wrench, lubricate them and reuse them.