Quote:
Originally posted by Hanno Spoelstra
The subject was discussed in the thread GMC 270 engine in CMP vehicles, but apparently that time you weren't around to help us out 
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Where was I then?
I'm going to have to go back and get more pics of this truck, aren't I?
Some of the more obvious external differences:
The "Harmonic Balancer" on the front of the C60X crank is a press on fit with internal slot for hand crank handle, CCKW is a slide on fit with a retaining bolt with starter dog (like Ford).
C60X 270 makes 125hp at 3000rpm, CCKW is governed to 2700rpm, NOT TO BE EXCEEDED.
C60X distributor has vacuum advance/retard plus internal flyweights, CCKW just flyweights.
I don't have a parts book for a CCKW or DUKW, so can't compare part numbers, but if anyone else does, we can solve some riddles.