Cummins have been mounted with the back end sticking out behind the cab to provide room for I'cooler, proper water radiator, very tight quarters no matter what one chooses.

Gassers can be mounted farther fwd.

Either way, such things as a disc brake axle, power steering, adequite cooling, engine noise, engine heat, air condidioning?, present challenges. '41 to '47 same body style.

With engine under cab, short engine compartment problems('41-'59) are not a problem.

Ed

Last edited by EdPruss; 08/09/2020 1:12 PM.
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.