I just did a overhaul on my LS. New head gasket, new pistons and rings, new timing belt, new water bump, had head machined by a shop, new seals and gaskets, new ARP head studs, new filters, new radiator, new thermostat. Now when my car is warm it struggles to start and burns white smoke when idling. When I drive it the white smokes stops. What can it be? Fluid levels stay the same.

 

White smoke is a indicator or coolant or water. How long dose it smoke, have you smelled it to get a idea of what it is? Head gasket may not have sealed properly or the gasket may be on upside down

 

Smells like coolant. Also head gasket is on correctly. I tripled check when installing it. I want to avoid removing the head.