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.
Additional Attributes:
GTIN: 00037995667543
Applications: Fits GM LS Engines with 1/4-inch Wide Flange
Color: Nickel Plated
Diameter: 8mm
Feature/Benefit: Wedge-Locking Technology Eliminates Constantly Re-Tightening Exhaust Collector Bolts; Blocks Bolt-Loosening Rotation caused by Vehicle Vibrations.
Finish: Nickel Plated
Length: 0.984 inch
Material: Steel
Part Type: Header Bolts
Extended Information:
Emissions : CARB Eligible
Life Cycle Status: Available To Order
Packaging:
Quantity of Each: 1
Package UOM: EA
Dimension: 6.75 x 4.5 x 1.75 inches
Weight: 1.25 PG
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