![]() This engine had an overhead valve design with offset valves and uniquely scalloped rocker covers, giving it a distinctive appearance. Chevrolet designed this engine for use in passenger cars and light trucks. The first version of the "Big Block" V8 Chevrolet engine, known as the W-series, was introduced in 1958. The last engine designation manufactured in this family are the Mark IV series. ![]() The first W-series big block, retroactively renamed Mark I, which debuted in 1958 at 348 cu in (5.7 L), was built in standard displacements up to 494 cu in (8.1 L), with aftermarket crate engines sold by Chevrolet exceeding 500 cu in (8.2 L). The Chevrolet Mark Engines colloquially referred to as the big block is a family of large-displacement, naturally-aspirated, 90°, overhead valve, gasoline-powered, V8 engines that were developed and produced by the Chevrolet Division of General Motors, from the 1950s until present.Ĭhevrolet had introduced its popular small block V8 in 1955, but needed to create an engine with more displacement to power its medium duty trucks and the heavier cars that were on the drawing board. ![]()
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