Okay, it could be a few things, but let's not jump to the extreme that your heads are warped, especially if it was not an issue before.
When you put the heads on there is an order of tightening the bolts and they have to be done a couple turns at a time. Get some new head gaskets, learn the tightening order, get a torque wrench, some head gasket sealer (ask in the AM and I will go to the garage, don't recall name of what I use).
Pull the head and do it over again. Might as well put heads on a sheet of glass to see if warped, but would not think so.
. . . sorry, just scrolled to bottom . . . . what raymor said.
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