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

Extend the life of your crankshaft by changing the firing order of your engine. The OEM firing order ends with cylinder 3 and begins with cylinders 1 and 2. The result is a 3-1-2 hit to the crankshaft. Duramax cranks have a tendency to break right behind the first rod throw at the intersection of the second main journal, right where the 3-1-2 hit would stress the crankshaft the most. Coincidence? We think not. After carefully researching the different firing orders available to a V-8 engine, SoCal Diesel was the first to implement this "Alternative Firing Order" camshaft for the Duramax engine. In moving cylinders 3, 1 and 2 away from each other, we have significantly extended the abuse the crankshaft can withstand. Swapping a few pins in the wiring harness will insure the ECM sends the injector signal to the correct cylinder. Wiring diagrams and instructions are included with every purchase. 

Features:

• The camshaft is an integral part of your engines breathing characteristics. 

• The camshaft lobe profiles need to be carefully matched to the rest of the engine components in order to achieve maximum performance for any given application. 
  

Camshaft Options:

Stage 1 Camshaft #3388AF Specifications-

• Does not require any piston valve pockets.

• Works well from idle past 3800 rpm.

• Valve Lash .012/.012

• Works well on the street from a stock truck to a modified street truck with a little extra power, but still needs to tow

Stage 2 Camshaft #6480AF Specifications-

• This is the #3388 cam's big brother, for those looking for the next level in performance.

• Requires .050 piston valve pockets.

• Works well from idle past 4200 rpm.

• Valve Lash .012/.012

• Works well on trucks with built motors that need that extra lift and duration to gain some more power

• This cam is optimized to top out around 1000 hp, if you don't tow and making more power, check out the 9100AF camshaft.

• Recommend the use of LLY or later lifters. Do not use LB7 lifters.

Strip/Sled Pull Camshaft #9100AF-

• Requires .075 piston valve pockets.

• Works well from 2500-5200 rpm.

• Requires a high stall converter, about 2800-3000 RPM 

• Valve Lash .012/.012

• This cam is designed for max effort use, it will not work well on vehicles that will be towing.

• We recommend the use of LLY or later lifters. Do not use LB7 lifters.

Strip/Sled Pull Camshaft #9200AF-

• Requires .075 piston valve pockets.

• Works well from 2500-5200 rpm.

• Requires a high stall converter, about 2800-3000 RPM

• Valve Lash .012/.012

• This cam has more lift and duration than the 9100AF cam, allowing for more power. Only recommended on max effort builds.

• We recommend the use of LLY or later lifters. Do not use LB7 lifters.

Valve Adjustment Procedure:

• Rotate the engine and adjust one cylinder at a time.

• When the exhaust valves just begin to open, adjust the intake.

• When the intake valves are just past maximum lift, adjust the exhaust.

Note:

• THE MANUFACTURE, SALE, OFFER FOR SALE, OR INSTALLATION OF THIS PRODUCT IS NOT LEGAL IN CALIFORNIA.