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requiring no modifications for installation
The linear spring rate (246 lb/in front
Calibration Is As Simple As A Two Mile Drive
50-inch tailpipes clear the factory spare tire and give you two choices of exit locations
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 requiring no modifications for installationPROFORM 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
