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SoCal Diesel Custom Ground 9100 Alternative Fire Order Keyed Duramax Camshaft

SCD9100AF - Z
SoCal Diesel 9100 Custom Duramax Alternative Fire Order Camshaft
Pricing: $1,100.00

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SoCal Diesel Custom Ground Alternative Fire Order Camshafts

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 Hot Street, dedicated Drag Racing and Sled Pulling. These camshafts will come with keyway.

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.

SoCal 9100 Alternative Fire Order Camshaft Benefits:

  • Great camshaft for the extreme engine builds utilizing large turbochargers
  • Very quick spool-up on large turbo applications
  • Excellent choice for twin and compound turbocharger applications
  • Alternative Fire Order Pattern
  • Race & Pulling Use Only. Not good for towing
  • Requires .075 piston valve pockets.


  • Works well from 2500-5200 rpm.
  • Requires a high stall converter.
  • Valve Lash .012/.012
  • We recommend the use of LLY or later lifters. Do not use LB7 lifters. 


Shipping Information

  • Item Requires Shipping
  • 17.0 lbs.
  • W6.0000” x H6.0000” x L24.0000”
  • Free Shipping
  • This item ships in its own box.

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