[Slam]

Oh the agony! I think everyone who's done a head job fears what you're describing. Sorry to hear about your case. I too have been watching your progress.

One thing: at least you know it runs! And if it runs once you can make it run again.

I agree with George - worst-case scenario is a cracked block/cylinder. But there's also a chance the gasket surfaces were contaminated, or you got a bad gasket, or your torque sequence was off. Regardless, you've got a do-over.