Fits GM BB 396-502 exc 348 and 409, Ford 5.0L, SB 289-302-351W, Mopar 414 Pontiac These direct bolt-on replacements are

These direct bolt-on replacements are designed to minimize wheel hop and improve cornering

5" in half inch increments

The linear spring rate (246 lb/in front

Worn pilot bearings cause rough shifting

Fits GM BB 396-502 exc 348 and 409, Ford 5.0L, SB 289-302-351W, Mopar 414 Pontiac These direct bolt-on replacements arePROFORM 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