i will check about the gasket being upside down. a week after the engine overheated i went and started it up, and it started first time. after about 10 seconds it started running rough and water was coming out of the back end of the exhaust. i removed the engine from the car took off the cylinder head and cylinders were flooded with water. i got a new gasket and ran water through the engine via a hose and the water just went straight to the cylinders again. i checked the block very closely and each cylinder, there seems to be no cracks anywhere...... How can i test if the inlet manifold is faulty?