Quote Originally Posted by tcmers
I've got a 350 short block on the way. I've got a recently rebuilt set of 400 heads. (with the steam holes) Can I use these on the 350 block, or am I asking for overheating or cracking problems? Don't want to buy new heads if I don't have to, as these are ready to go. Thanks.
I would try and find a heavier casting number to be re-built.
993,441 are both good picks.