Originally Posted by EXPLICIT

You run forged pistons with the rebuild. When cold the tolerances between the piston ring to bore face would be greater until warm, due to expansion. This can allow oil to squeeze past the rings, settle on the bottom of the bores and burn on initial ignition (cold start). IF its only on start up i wouldn't worry about it. If its pluming like a rave and doing so when the engines on load.......sell it