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Unless otherwise marked, all engines and parts are for competition use only; not legal for use on pollution controlled vehicles at any time.


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Alternative Firing Order Duramax Camshaft #3388

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Product Description

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.


 4prop-65.jpg    WARNING: Cancer and reproductive harm - www.p65warnings.ca.gov