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I found this site while searching for a set of pistons for a 1957 GMC 370 engine. Just for the record, GMC did use an Oldsmobile engine in their 550 and 600 series trucks from 57-59. It was a 371 Oldsmobile block, but GMC called it a 370. I know this for a fact because I drove one several hundred thousand miles almost 50 years ago and rebuilt the engine several times. The 55 -59 GMC parts book for the 550 series through 970 series lists the engine and many parts carry the same part number as Olds 371. The major differences were the 370 GMC used a forged dished piston, positive rotating valves and an adapter which allowed using a truck Holly "teapot" carb on top of an Olds manifold. I also invite anyone interested in old GMC's to visit the OldGMCforums which is hosted by Oldcarkook.
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