GMC 270

The GMC straight-6 engine was a series of gasoline-powered straight-six engines introduced in the 1939 model year by the GMC Trucks division of General Motors.

The new engine family featured a valve-in-head design, pioneered by Buick and also used by the Chevrolet division’s contemporary “Stovebolt Six” engine. Many displacements were produced using three block sizes: “Group 1” (small), “Group 2” (mid-size) and “Group 3” (large).

The straight-6 engine was replaced by the GMC V6 engine in 1960, remaining in use only in certain light-duty models of the P-series step van until 1962.

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4-Speed Hydra-Matic, General Motors, General Motors, GM Truck & Coach Division, Old Pueblo Transit Co., Santa Cruz Metropolitan Transit District, Santa Cruz Transit, Transit

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