A freshly built motor will trap oil in the low points in the casting around the lifter bores and in other above the crankshaft centerline in places that will not drain back into the oil pan on the first start up also in the oil galleys :and on every surface inside the motor that didn't have oil splashed or split on it while being assembled work shruggy:

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)