Callies Carbocore Stage 2 Alternate Firing Camshaft, 2001-2016 LB7/LLY/LBZ/LMM/LML

Part# DMAX-270-002

$674.10 Includes Free Shipping.

WARNING: Cancer and Reproductive Harm - www.P65Warnings.Ca.Gov

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

Carbocore- Carburized & Hardened 8620 steel camshaft cores are produced to AMS 2301 (AQ) standards. The Callies engineering staff can create an unground lobe profile to our exact requirements. Carbocore cams are machined and heat treated entirely in house at Callies. The Carbocore process creates a visually stunning finish and will also hold up better than the Indurocore cams in dirty applications such as dirt drags, dirt racing, and off-road vehicles.

The main reason for modifying the Duramax firing order with the camshaft is to relieve stress on the front portion of the crankshaft in higher performance applications. The OEM firing order ends at Cylinder #3 and then continues from the beginning through cylinders 1 and 2. The Duramax Cranks see the most strain and tend to break right behind the first rod throw at the intersection of the second main journal (the snout). We have seen failures on anything from mildly modified daily drivers to all-out competition trucks. The Duramax engine Harmonics become too stressful on the cranks when getting into the higher RPM ranges and bigger power levels with the OEM firing order. With this DuraStar Alternate Firing Camshaft, cylinders 1, 2, and 3 are moved away from each other to distribute the stress of combustion more evenly and help reduce the abuse to your crankshaft. Duramax engines respond to alternate firing camshafts better than any other diesel on the market. Thanks to the high flow aluminum heads, the right camshaft can increase the Duramax's Head flow considerably. Dyno tests have proven a much broader power curve, increasing HP and Torque through all RPM's making this mod perfect for anything from a daily driver to an NHRDA comp truck.

Notes:

  • *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.*
  • Engine Wiring Harness modifications are required due to the new firing order. 
  • *.050" Piston Valve Reliefs Required*
  • Great Replacement for higher horsepower racing and sled pulling applications! (600-1200 HP)
  • Stage 2, .050" Piston Valve Reliefs Required! Works great at Idle to well past 4200 RPM

Instructions: