How to Tell a WWII GMC 270

Facts, Tips, Hints, and other snippets about the CCKW, Chevy, or DUKW
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Fort Susquehanna
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How to Tell a WWII GMC 270

Post by Fort Susquehanna »

Can someone tell me the differences between wartime and post-WWII 270 engines?
1944 CCKW 353H1
dr deuce
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Re: How to Tell a WWII GMC 270

Post by dr deuce »

OK, from what I have observed:

The later 270's (50's) have no foot on the front for a motor mount. Not sure when they started this

The intake manifold has larger diameter runners and a larger base on the carb.

Not sure about the 270's in the 50's, but the 302's in the 50's all have a fatal intake manifold flaw that I have observed in about 6 different engines where the heat box under the carb cracks or actually looses casting and that lets exhaust leak out. I have a couple that have had the box removed and steel welded over the opening to prevent exhaust from leaking.

The pistond and head cannot be interchanged with th eolder engines; turbo top in WW2 and flat later

How is that for starters?
Dr Deuce Over 50,000 driven miles in a CCKW
1942 CCKW closed cab shopvan
1943 CCKW closed cab cargo w/M32 MG mount
1944 CCKW open cab LeRoi Kompressor
1944 CCKW open cab F1 Aircraft fueler tanker
1945 CCKW open cab cargo w/artic cab
1942 Chev cargo
1942 Chev K51 Panel
1944 Chev M6 Bomb Truck
1942 GPW Jeep
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