I am at my wits end on this one. Total rebuild here. NOS block,pistons, etc... Head has new everything. Valve guides springs push rod tubes valves everything. First assembly and start up had water in oil. Water was in valve cover flowing back into crankcase. Took it apart cleaned everything found nothing wrong. Second assembly and start up had water in cylinders coming from two outer valves (exhaust). Had head pressure checked and no leakage. Third assembly with new head gasket manifold gasket etc... start up and run to 160 degrees (operating temp) shut down let cool then re torque head to 96 ft lbs. Have water in oil again. Can't figure this out. Any ideas cause this is driving me crazy.