The Pontiac versions of the GMC engines had lower compression (dished pistons) and Bendix-Stromberg 2 barrel carbs instead of Rochesters. They were painted red. 3 speed transmissions were a mix of Muncie SM-318&319 and Borg Warner T85 and T89. A Muncie SM-420 four speed was also offered. The automatic tranny option was a Dual-Range Hydra-Matic 4 speed that was almost the same as Caddy, Olds and Pontiac GM car options from 1952-56.
Other than pistons, 95%+ of engine parts interchange.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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