| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Nothing much interchanges. GMC's had two(at least) heads, large and small intake ports, not all heads fit all engines because of piston domes being different, for example. Patrick has a good catalogue that explains this. GMC always had full pressure oiling. GMC engines about 3" longer, radiator within core support to accommodate this, rather than behind like Chevy.
Ed
'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.
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