Fits GM BB 396-502 exc 348 and 409, Ford 5.0L, SB 289-302-351W, Mopar 413PROFORM Wedge Locking Header Bolts ELIMINATE the need to constantly re tighten collector bolts, and without the need for clips, pins, racing wire, chemicals or gunk. The secret is in the Wedge Locking Washer's super hardened external teeth that "bite" into the bottom of the bolt head and the top flange surface. Vibrations that normally cause other bolts to loosen, are blocked by the wedge locking action that uses tension, instead of friction to stay

Bolt-In InstallationMade in the USAFitment NotesKit contains one pair of struts

with trailing arm relocation brackets for enhanced traction or rear steer adjustment

Installation time is 2-3 hours

Whether you drag race

CNC machining

During high cornering loads

Fits Manual Transmissions Only

Viscosity Index 172

the all aluminum 19 row Stacked Plate cooler features sturdy furnace brazed construction

and an offset fin design on the charge path allows for minimal pressure loss

These subframe connectors along with all our tubular models are the tightest fitting connectors on the market

Vibrant Performance Tube Adapter Fittings are lightweight and constructed from 6061 Aluminum Alloy