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the heads interchange I know they will because when the 383 hp engine was introduced it had the heads that would be used on the 440 super commando and like I said above the 383 was simply given a larger bore (sorry I got it backwards above) so if the 383 had 440 heads that means you can put 440 heads on a 400 its not rocket science its just common sense as far as keeping my stock heads and porting them id rather not the 440 heads give better performance than the open port 400s thanx for the info above though im still considering options and ill add yours to the list plus like I said above im not going with a stroker there to expensive and powerful at my age I meen im just getting my permit and I don't need to kill my self on my first ride
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