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Is the pontiac 400 engine the same block as the 455 engine with a different stroke and bore?

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  1. No, the 400 uses a 3.0" crankshaft main bearing diameter - and the 455 has a 3.25" main bearing diameter.

    Bore X Stroke
    4.12" X 3.75" = 400
    4.15" X 4.21" = 455

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