I did my first 7m rebuild a few months ago and upon startup had water in the oil. So I took it apart and started over. I took the head and block to a new place to have machined to accept a MLS gasket. I started the car up yesterday and deja vu, coolant and BLACK smoke coming from the back of the turbo. I don't have the downpipe hooked up, so no o2 sensor either. Im befuddled. I took no shortcuts and double and triple checked my work. The head was pressure tested, and passed just as it did the first time, I don't know how the block was tested but supposedly it was. What can cause this much coolant loss? I have too much time and money invested now to not fix it. But I have to get it right this time. Coolant should mean white smoke should it not? Yet, sure as can be, a puddle of water under the exhaust side of the firewall and the firewall is blackened with whaqt looks like carbon deposit and smells like gas. Someone point me in the right direction? There is def coolant in the oil, again. Where the pcv is on the valve covers theres some crystallization there from antifreeze. Bad block? Could the head be bad although it was pressure tested?