Hey Guys
Nissan K15 engine has 12000 + hrs

Having white smoke issue(plenty)
unit was running for few months with smoking issue, was not using oil,
replaced head gasket, rings, bearing, honed block, valve stem seals, gas regulator & filter lock Skimmed & pressure tested head.
removed exhaust at manifold to check - smoke direct from exh. manifold

No smoke on startup, yet plenty on revving up.
checked all the obvious signs. Leak test to follow from coolant engineers.

Unit was smoking prior to overheating, hence reason for ripping the head off.
Head gasket was replaced before by previous technicians for overheating / radiator issues.
Any suggestions or positive feedback welcome.