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STAGE 1 (PN: PDM-DMXAFS1) 1000+hp Capable Alternate Firing Order (relieves stress on crankshaft) Billet For Ultimate Strength Keyed To Prevent Cam Gear Slipping Requires 130# Valve Springs STAGE 2 (PN: PDM-DMXAFS2) 1000+hp Capable Alternate Firing Order (relieves stress on crankshaft) Billet For Ultimate Strength Keyed To Prevent Cam Gear Slipping .085" Valve Reliefs Required Requires 130# Valve Springs Piston to valve clearance should always be measured when installing an aftermarket camshaft. The core must be returned within 90 days for full credit.