Quote:
Originally Posted by Bill Hanlon
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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Bill, are there any differences or issues installing the later(75 455) engines in the 55 GMC half ton trucks? I'm concerned about engine and motor mounts location. And were the GMC trucks 12 volts at that time?