Hyndai Atos 2000 hubby is mechanic he has down 3 head jobs valve seals head gaskets 3 x.lastly put in new piston rings started it let it run for a time no smoke been on blocks for 2 months gave it gas white smoke coming out with drops of water from tail pipe we are at our wits end...please any suggestions would be appreciated

 

Do you know if the engine and/or head have been checked for cracks?
Procedure called Magneflux is used to determine this.

We could be jumping to conclusions here . If the vehicle has set for a long time , moisture could have accumulated in the exhaust system.
Does the condition still exist after the engine has reached operating temp?
Do we know if the engine has experienced severe overheating causing a warped condition? Were these things checked as part of the inspection before assembly?

 

never overheated. Has excellent compression changed heads same thing. White smoke has no smell car been laid up 3 months before fixing it had some smoke only when going up hills. Car starts fine only problem is the smoke. Or watever it is..drips of water from exhaust.
want to know what else could it be.
head job.
valve job
piston rings installed
pcv cleaned.
About to dump it if cant figure out problem

 

You might consider this,
Remove the spark plugs and look them over carefully keeping tract of which cyl they came from.
If coolant is getting into the combustion chamber of 1 or 2 cyls you should see the white deposits on the plugs, also has the coolant level gone down any?
The condition of the plugs can tell you if it is oil, or coolant.
It wouldn't be the first time coolant was leaking down to the exhaust and was pushed out the tailpipe.

I'm not going to question the quality of the "rebuild" , but could the rings have been installed incorrectly ?
It would run, but how well?