Valve stuck again...

Ouch...

Skrews is likely correct--I don't want to insinuate anything, but did you have the heads looked at before you installed them, or did you bring heads to a machinist and have them assembled? I've seen similar issues with OOTB heads elsewhere...

Roller cams are pretty tough, so it should be OK-can you measure the lift the way it sits right now and compare to other lobes or your cam card?