Fits GM LS Engines with 1/4in Wide Flange 1984-pontiac-firebird-esi1382254 Perfect for light-duty use and

Perfect for light-duty use and occasional light towing

it reduces wheel hop

1964-1972 GM A-Body Tubular Front Lower A-Arms

Upgrade to UMI tubular adjustable control arms for reduced wheel hop

If a vehicle is lowered or lifted beyond a certain point

Fits GM LS Engines with 1/4in Wide Flange 1984-pontiac-firebird-esi1382254 Perfect for light-duty use andEach 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: