ABOUT THIS PRODUCT

Each PROFORM 12.9 Steel (equiv. Grade 8+) Header Bolt is permanently assembled with a pair of special washers. When the bolt is torqued to 28+ ft-lbs, the washers super-hardened external teeth bite into and grip the bottom of the bolt head and the top surface of the header. After being self-locked in this manner, any bolt-loosening rotation is blocked by a wedge-locking action created by the washers interfacing, matching cams. It's an uphill climb: vibration that might ordinarily loosen the bolt actually increases the wedge-locking tension, securing the bolt even more. Because this simple wedge-locking method uses tension instead of friction, contact with oil actually facilitates the wedge effect. When changing headers, PROFORM Header Bolts can be untightened with a normal wrench, lubricated, and reused.

Product Features:

• Exhaust Header Bolt
• Nickel Plated Finish
• Made from Grade 8 Steel
• Wedge-Locking Technology
• Fits GM LS Engines with 1/4in Wide Flange
• Hex Head Type
• M8 Thread X 0.984 Inch Long
• 100% New Components; Not Re-man or Refurbished
• Pre-Assembled Wedge-Locking Washers
• Includes 12 Bolts and Washers
• Sold as a Set
• PROFORM Parts Brand Product