I've got a 96 GMC Safari AWD Van. It was leaking coolant from the intake manifold gasket to the top of the engine (no water in oil). I had to move the van around the driveway a few times til I had time to replace intake gasket. I replaced the gasket, filled cooling system and check the oil. NOW I have a lot of water in the oil. I drained the oil, water slowly kept coming out. The more I put in the radiator the more that slowly comes out the oil pan. I pulled the intake and everything looked fine, I reassembled still the same. I purchased a cooling system pressure test and it'll hold about 3-5lb pressure for a few minuets and then leak down and more water out the pan. I have now pulled the intake again and duct taped the head water passages and plugged all disconnected hoses and put water in the radiator , again water slowly out the oil pan.
So now I believe I have either a cracked block/head or headgasket leaking. Any ideas how to diagnose further?
Thanks Kevin