White smoke coming from my tail pipe but it has brand new heads and all on 2001 Buick Century

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It's a used car I got it for 800 but that's the only problem I have is the white smoke
(3) Answers
Agree with gh, is it loosing coolant, overheating?
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agree with gear head or poss crack in cyl head that was over looked
probably a faulty of incorrect installation on the head gasket.
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