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What size engines are big blocks?

Updated: 10/24/2022
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15y ago

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In Chevy and GMC vehicles, the "big block" refers to a larger displacement engine. These engines can include the 396ci, 409ci, 427ci, 454ci, 502ci etc... Simply a larger dispacement does not always define an engine as being a big block. In some cases GM has made engines with 400ci of displacement which are considered small blocks.

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Q: What size engines are big blocks?
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