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Old April 11th, 2006, 07:49 PM   #11
Yetti
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one of a couple problems could be wrong with the engine that no one has mensioned. if its built with the correct heads. if its a true 400 then the heads needed to be moded to fit. the stock 400 head have steam holes between the chambers and help keep the cylinders cool since their cast so close together. if some used stock chevy head from any other motor they will cause detenation you cannot stop no matter what. i would suggest pulling the heads if the easy stuff doesn't work. most likely you find the wrong heads for your block
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