It's me again asking some more questions OK same vehicle, 88 k5 with the TBI 350. I have some questions regarding a smoke problem, OK it doesn't smoke to bad just on start up and if I'm sitting at a light it will puff out a cloud of white smoke out of the passenger side tail pipe, now I have done a little research and came across a few possibilities, one being head gaskets but it doesn't over heat and haven't had to add any antifreeze and another are valve seals or guides which are notorious for these engines and last could be rings but haven't really notice any oil loss although I don't really check it as often, so should just go ahead and do head gasket and valve seal and see if that helps also before I decided to take apart the top end are there some tests I can do to know for sure what the problem could be?