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My truck is shootin black smoke on startup and blue smoke when it warms up...Is this Valve seals? Or valvetrain related? This is a 360 but was rebuilt in 99....I know my intake gasket is bad too...Is this the likely problem?
Black smoke equals Too much Gas (choke)
Blue Smoke equals too much oil. (ie: Valve seals)
White smoke equals water in the combustion chamber (head gasket)