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GM Cummins Engine Swap - Diesel Power

B-Series Power for GM Trucks

Photography by E.M. McCully

Brand loyalty lines get blurred every time guys start talking about diesel engines. Dodge doesn't make the Cummins, Ford doesn't build the Power Stroke, and GM had to team up with Isuzu to design the Duramax. The reality is that each one of those engines could wind up in a bunch of different vehicles. Who's to say what badge should be on the hood?

The only limits to slipping any of these engines under the hood of a different truck are your own skills. Seeing as how the Cummins B-Series engine is probably the most popular engine for swapping, we wanted to follow along and see just what it takes to pull something like this off. We knew Bryan McCully of Fabworx Off-Road had been planning a factory-appearing Cummins swap for his '96 GMC K3500. So, we thought we'd follow along.

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With everything physically bolted in place, McCully enlisted the help of Jesse Slye and Adam McLauflin to plumb and wire his new mill. The GMC's fuel feed and return lines were hooked up to the Cummins lift pump on the driver side of the engine. The GMC's electric lift pump was then replaced with a short piece of 3/8-inch metal line. McCully was able to reuse the Dodge's mechanical throttle cable by retrofitting an accelerator pedal from a '96 gasoline GMC truck (the 6.5L engine is drive-by-wire) and reworking the end of the pedal linkage to achieve wide-open throttle. At this point, the power steering pump was upgraded with a unit from PSC to supply the GMC's hydroboost brakes yet still mesh with the drive gear on the back of the Cummins vacuum pump.

SOURCES
Atlas Spring
N/A
www.atlasleafspring.com
Fabworx Off-Road
www.fabworxoffroad.com
Designit Prototype
www.designitprototype.com
Reliable Goods
www.reliablegoods.com
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