Freshly built motor.Got it off a friend that needed cash. It has like 350 miles on it and at random times it will just pour smoke out the muffler. I start the car up in the moring(it cold here) You get that white smoke i and just smells like exhaust. I let the car get to operating temp before driving,then I'm on my way to work and right as soon as i get on the freeway the same spot everyday when i make a left lol starts smoking and i'm not even getting on the car. Rpms under 4k with the darton sleeves, After driving for about 45sec it quites. So i'm driving normal and get to work and right as im turning into the the parking lot it will just start smoking again. I know when it's getting ready to start smoking because you can hear the clyinder drop and after 30sec it fine car runs great. I'm going to do a leak/comp test tomorrow and see what the hell is going on.

Motor is a b18b1/b16 head/gsr cams

Now say if the break-in wasnt done right can I start doing it now or do I have to tear the motor down rehone and re ring

It's burning oil