Alternative Firing Order Duramax Camshaft #3388AF

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.

• Does not require any piston valve pockets.
• Works well from idle past 3800 rpm.
• Valve Lash .012/.012

• 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. 
• We have designed profiles to meet many different applications that include dedicated Drag Racing and Sled Pulling. 

Valve Adjustment Procedure

• 1)     Rotate the engine and adjust one cylinder at a time.
• 2)     When the exhaust valves just begin to open, adjust the intake.
• 3)     When the intake valves are just past maximum lift, adjust the exhaust.