I have a 94 sc with an engine that has white smoke out the tailpipe. I've rebuilt the hg's twice now with the same result each time, white smoke with condensation and bubbles in the cooling system. The second time I had my heads decked but I haven't had the block resurfaced. I checked it for flatness with a straight edge and feeler gage and everything checked out. So unless I screwed up somewhere or overlooked something I can find no cause to this. My next step is to try a compression leak test to confirm it is combustion games coming out the cooling system.