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: will a 400 ext. bal flexplate work on a 454 big block caribbean Jul 27th, 08, 10:02 PM I am new to BBC - so what are the external balance requirements for the stock crank 454 as far as flexplate goes ?? is it the same weight thing found on a 400 flexplate?? mr 4 speed Jul 27th, 08, 10:05 PM The weights are not the same. You need a flexplate specific to the 454 Those are your requirements :) caribbean Jul 28th, 08, 6:33 AM thanks - great!!! I get to keep my "just in case" new 400 plate (got int. bal stroker kit instead) for another couple years - LOL | ||