It seems like I have posted this 20 times this week. "Do a search on the archives and you will come up with lots to read."
That being said, I am putting a cummins 4bta out of a chevy P30 delivery van in a 53 one ton. If it works as nice as I hope, I'll be putting one in the 39. The cummins 4 cylinders are rather expensive unless you can get your local frito lay fleet manager to hook you up.
You might fit a cummins 6 cylinder in a gmc truck, but you need at least 39 inches, so it ain't gonna fit in a chevy without some hacking.
in a 1/2 ton truck, I would box the frame. A cummins 4bt pumps out 120 hp like your stovebolt 6 but it also delivers 300+ ft-lbs of torque at 800 rpm. Comparable with a v8
as posted earlier last week to a similar question... check out
adelmans truck parts and ask for Brian if you call. They have aluminum Detroit 3-53s with SM465s and all electronics available out of DUKWs for CHEAP. Only 85 hp and a narrow powerband, but should scoot a 1/2 ton around on BIODIESEL.
don't forget to swap rear ends
