Wedge-Locking Header Bolts Hex Head M8 X .984 Inch Chevy LS Nickel Plt 12 Pcs Proform Exhaust Header Gasket Includes 1 Inch Long 1/4-20

Includes 1 Inch Long 1/4-20 Mounting Studs

3/8-16 Inch x 1 Inch Long

41:1 gear reduction

Additional features include peak hold

Same Holdowns As 66291

Wedge-Locking Header Bolts Hex Head M8 X .984 Inch Chevy LS Nickel Plt 12 Pcs Proform Exhaust Header Gasket Includes 1 Inch Long 1/4-20Each PROFORM 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. Its an uphill climb: vibration that might