Gm inline 6 casting numbers 877127 gm 863/26/2023 Drawings by David Kimble.Production of the original small-block began in the fall of 1954, for the 1955 model year, with a displacement of 265 cid, growing incrementally over time until reaching 400 cid in 1970. This drawing is of the 1967 version of the 302 cid Chevrolet. The Chevrolet big-block is a series of large displacement V8 engines that were developed and used in the 1950s through the 1970s. Chevrolet had introduced its popular small-block V8 in 1955, but needed something larger to power the medium-duty trucks and its heavier cars that were on the drawing board. These blocks are referred to as the “Gen I” small-block, the subsequent “Gen II” LT, and “Generation III/IV” LS, along with the current “Generation V” (LT/EcoTec3) engines. The Chevrolet small-block engine is a series of automobile V8 engines built by the Chevrolet Division of General Motors using the same basic, and for a V8, smaller engine block.
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