ok, here is the problem. I just rebuilt my b18a1. finally got it in the car, started to fill her up with fluids. got the oil in, the atf in. started putting coolant in and found out my oil pan gasket was leaking....the hard way. there was coolant spilling out of it. so I freak out for a sec. I've done some searching and found out I most likely put the head gasket on upside down. is there anything else it could be? maybe is there a hose I could have mixed up when dropping the engine back in? I know the cylinder walls are fine, I know the head isn't cracked... what else could it be?