I just had my cylinder heads checked for cracks and warpage. The machine shop said there were no cracks and milled 5 thousands for warpage. We put it all back together, with the new head gasket set, started it up and we have a ton of white smoke pouring out of the tail pipe. I know white smoke means antifreeze in the cylinders, but my question is how is this possible?! I am hoping the people who milled the heads did not screw me over. Are there any other possible causes for the white exhaust smoke, other than a cracked head or blown head gasket?