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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. Prior to the introduction of this new engine design GMC trucks had been powered by straight-six engines designed by the Buick , Pontiac and Oldsmobile divisions of GM.
It was its own separate engine design, based on a single block casting, [19] which had four exhaust manifolds, two carburetors and intake manifolds, and two distributor caps driven by a single distributor drive, [19] plus other parts from the 351 V6. A total of 56 major parts are interchangeable between the Twin-Six and the other GMC V6 engines ...
GMC 302 (right front) Chevrolet BV-1001 (left side) Chevrolet BV-1001 (right side) Continental. Model Displacement Fuel Type Power Torque Used in AO42 [a]
It offers the airflow of more expensive heads, at a much lower cost. It does, however, require a specific intake manifold (the L31 has four bolts per head attaching the intake manifold, as opposed to the "traditional" six bolts per head found on older Chevrolet small-blocks). Chevrolet's L31 was replaced by GM's LS-based 5.3L LM7 and 6.0L LQ4.
A redesigned cylinder head and manifold for improved air flow. Variable exhaust valve timing (the LW2 engine only had variable intake valve timing) Specially-developed fuel injectors. New pistons with pentroof-style centre-domes and valve eyelets for a higher compression ratio of 12.2:1 (compared to 10.2:1 for the dual fuel engine).
Bored out to 302 cu in (4.9 L), it had high-compression pistons, "097 Duntov" mechanical-lifter camshaft, cast-iron four-barrel intake manifold, and a Quadrajet carburetor. With stock Turbo Hydramatic, stock Vega rear end and street tires, the car ran a sub-14-second quarter-mile. [47]