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Manufactured throughout the '70s, Chrylser's 400 is a larger-bore variant of the 383. Technically, both the 383 and 400 are B engines, having a lower deck height than the RB blocks (9.980-inch versus 10.725). The 400 is hugely oversquare with a large 4.342-inch bore and a tiny 3.38-inch stroke, shorter than a 350-inch small-block Chevy. That big bore size helps the engine breathe, because the cylinder walls do not shroud the intake and exhaust valves, making this block an interesting choice for a potentially high-rpm powerplant or an ideal candidate for a stroker crankshaft.