Ok here's the story saturday night me and my brother went out and had a race between his 79 lincoln mark V 400 V8 and my 77 deville 425 v8, I won, but today I was at the junkyard came out started my car and a big poof of light gray smoke came pass the window. Now on sunday I changed the oil but before I changed it I ran some B12 through the oil then drained and replaced the filter plus sprayed some carb cleaner down all four barrels, I guess what I want to know is was what I saw just from the B12 and carb cleaner or did I mess up my valves also when I got home I let the car set for 30min went out and started it ran back and looked at the exahust and saw a little more smoke just for a second one more thing my converter is removed could it have anything to do with it.

smokes probably always been there, you just noticed it... If it runs fine and you don't want to do any major work, I'd leave it alone...My old 68 Plymouth always puffed a little smoke on startup, but I never worried about it until I scored a brand new set of heads for it for freeeeee. I found them on the floorboard of an old pickup I was given, and the 906 heads were still wrapped in plastic from the machine shop...instant swap and the smoke was gone :) Don't know about yours, I'd just leave it be and not worry about it though. The carb cleaner and such would have been burnt off right away, so that's unlikely what caused it.

I have a 4 wheel drive hillclimber buggy with a 472 cad. engine in it and after extensive hard runs it does the same thing because i am still using the stock pcv system.its not really anything to worry about just a little scary.see the thread to (smoke)

sorry. see thread posted pcv