Thread: smoke on start up

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AJust a few things to look for.
1. Piston to cylinder clearance. Forged pistons generally require a bit more clearance than cast pistons, and sometimes create the condition you are experiencing, or the clearance may actually be too much. Check the specs for your pistons.
2. Are the valve seals still in their proper place. Sometimes they can move.
3.Is the intake sealed up good?
4.I would pull all the spark plugs and see which cylinders are getting too much oil, and do a compression test to see if all the cylinders are sealing up equally. Could be that some cylinders are sealing tighter. Have heard of the quality of some pistons having deteriorated lately, as in not holding consistent dimensions, resulting in poor piston to cylinder wall clearances.
5.Piston rings installed upside down can cause this condition
6.Not to scare you, but make sure there are no cracks in block or heads, but with all new or re-machined parts, that should not be a problem, but it has happened!
7.Could just need to break in for a little longer, put some miles on the engine and see if it gets better. May not even be a problem.
Hope you find the problem, and when it is fixed, you will enjoy your car that much more for a challenge that was conquered.