[Dennis Kelley]

It sounds like coolant in the combustion chamber. Retorque the intake and see if that helps. When it warms up somethings expanding sealing the leak. does the smoke come out of one or both side pipes? I would not run the engine if you don't get it to stop smoking. where the head bolts loose? After you retorque the intake let the motor run and get hot so that all the coolant is burnt off. then restart from cold. I bet that its your intake gasket.

later Dennis