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heads were cracked in 7 places, valve seals were badSean
I'm not surprised with those heads. the 400 block is great because its a Siamese block meaning the pistons are opposed and not staggered like a 350 this makes for a great rotating assembly. the very very weak and restrictive link is the heads. there weak and reduce the power by a lot (just a bad design). my opinion would be to go with a different set of cylinder heads to bring your power back up to a 350 or higher really easy. but of corse like previously mentioned start with the tune up options first.