Production of the original small-block began in late 1954 for the 1955 model year, with a displacement of 265 cu in (4.3 L), growing over time to 400 cu in (6.6 L) by 1970. Later generation engines have only the rod bearings, transmission-to-block bolt pattern and bore spacing in common with the Generation I and II engines. The Generation II engine is largely an improved version of the Generation I, having many interchangeable parts and dimensions. Generation I and Generation II LT engines are distinct from subsequent LS-based small-block engines. The engine block and cylinder heads were cast at Saginaw Metal Casting Operations in Saginaw, Michigan. Engineer Ed Cole is credited with leading the design for this engine. ![]() Referred to as a "small-block" for its size relative to the physically much larger Chevrolet big-block engines, the small block family spanned from 262 cu in (4.3 L) to 400 cu in (6.6 L) in displacement. The Chevrolet small-block engine is a series of gasoline-powered, V-8 automobile engines, produced by the Chevrolet division of General Motors between 19, using the same basic engine block.
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