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Old 12-07-2021, 02:22 PM   #12
diesel burner
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Join Date: Nov 2017
Location: Enterprise Oregon
Posts: 58
Re: My 71 K20 Cummins swap

I had to flip the exhaust manifold to clear the heater box, because of that I had to extend the aftercooler pipe on that side. On the drivers side the original pipe fits perfect. Because the turbo is higher, I had to lengthen the down pipe for the exhaust.... I had to modify the 1st gen exhaust extensively but it was a good starting point. Other members said they had a tight fit routing 4" exhaust around transfer case, but I have over an inch from cab floor and 3/4" from transfer case. I don't think there was a single piece of the exhaust that didn't get modified.
I used the existing in cab fuel tank, I just welded a return line fitting in alongside the existing supply line.
I found a 1st gen fan hub bracket, but it still put the fan too low to use the dodge shroud..... so I had a local machine shop make me one with a piece of DOM and flat plate.
I had to cut holes in the inner fenders to allow for the aftercooler pipes, the only thing i had to do to the aftercooler is notch the top plate about 1/2 inch back to clear the hood latch.
I was able to reuse the top radiator hose, but had to find a different one for the bottom..... Napa had one with the right bends to fit.
I built 2 battery boxes, I used a F^#d regulator with the dodge alternator(don't tell my chevy it's got ford parts on it). I had a hard time figuring out where to put the air filter because of the hood hinges...
I used the dodge throttle cable, had to modify the throttle pedal a little.
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71 C10 Cheyenne 396, turbo 400
71 C20 Custom Camper 383,tko 600,14 bolt project
71 K20 Custom,Cummins,NV4500,NP205,dana 60F,dana 80R
06 GMC sierra 2500 extended cab duramax,allison
05 Toyota Corolla (commuter)
18 Chevy Tahoe RST (wifes car)
08 HD Roadglide
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