My 87 k5 smokes when i start it for about 10 secs, then the first one or two times i come off the gas in neutral or park, but once i drive for 30 secs it fine. This is should be valve seals right? I;m doin em on sunday so lemme know if you have any tricks! I' gonna use the rope thing as i have no compressor. anything else? Also I had a 74 350 and it had the o rings at the top, does my 87 tbi 305 need those or just the umbrella's? Thanks for the help!