Fits: 2001 thru 2016 Chevy Silverado/GMC Sierra 2500HD/3500HD LB7/LLY/LBZ/LMM/LML Duramax Diesel

The main reason for changing the firing order with the camshaft is to relieve stress on the front portion of the crankshaft. The OEM firing order ends with cylinder #3 and begins with cylinders #1 and #2. Duramax engine crankshafts have a tendency to break right behind the first rod throw at the intersection of the second main journal. With a Wagler Competition alternate firing camshaft, cylinders 1, 2, and 3 are moved away from each other to help extend the abuse the crankshaft can withstand.

Features:

• .050" piston valve reliefs needed
• Great replacement for street & race
• Relieves crankshaft stress
• Reduces chances of broken crankshaft and costly repairs
• Simple wiring pin swap, no major modifications needed

Includes:

• Stage 2 alternate firing camshaft

Notes:

• Engine wiring harness modifications are required due to the new firing order
• .050" piston valve reliefs needed

*NOT LEGAL FOR SALE OR USE IN CALIFORNIA. THE MANUFACTURE, SALE, OFFER FOR SALE, OR INSTALLATION OF THIS PRODUCT MAY ALSO BE ILLEGAL NATIONWIDE UNDER THE FEDERAL CLEAN AIR ACT (42 U.S.C. § 7522(A)(3))*

*This product is ONLY designed for closed course racing where it is legal to do so. Any other use will be in violation of local, state, and federal laws. We are not responsible for unlawful use of this product.*

Instructions:

• LB7 - 2001-2004
• LLY - 2004.5-2005
• LBZ - 2006-2007
• LMM - 2007.5-2010
• LML - 2011-2016