it's a gsr motor. everything is pretty much upgraded new valvetrain, pistons, rods, cams, sprockets etc. everything except the valve guides and the valve seals. i no i should've changed it, but the motor was running really good before i even did anything to it. i really think it's the valve guides and valve seals. never did a leak down pressure test or anything yet. just want to see what everyone here has to say. we pretty much did the head gasket correctly went to torque spec and sequence. do you really think it could be burn off? how long does that usually last for? oil burning has to be either burning from the oil rings from the pistons or the valves seals/ guides from the head.