Fits GM LS Engines with 1/4in Wide Flange 1984-pontiac-firebird-esi1382254 If a vehicle is lowered

If a vehicle is lowered or lifted beyond a certain point

and grease-able polyurethane bushings with grease fittings

The hardware supplied makes this set-up a 100% bolt in and will require no drilling

and bushing improvement

billet aluminum vertical links (TCA046) are CNC-machined from 6061-T6 billet aluminum

Fits GM LS Engines with 1/4in Wide Flange 1984-pontiac-firebird-esi1382254 If a vehicle is loweredEach 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: