And again I've had this problem before (but not as bad) and thats why I ended up milling the heads. It could very possibly be that my deck is warped, bit I'd think flatter heads would at least help with that and not make the problem more prominent.
Another thing is the material between the coolant port and mounting holes is pretty narrow. I ran and took some measurements real quick. If it were pushing out, this would be the narrowest spot. But it could have nothing to do as well,just thought I'd put everything out there just in case.
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