SoCal Alternate Firing Order | Drag Racing | Sled Pulling #9200AF | GM Duramax

• 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.

• Requires .075 piston valve pockets.

• Works well from 2500-5200 rpm.

• Requires a high stall converter.

• 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