New motors may take a while for the rings to seal up well Did the block have a torque plate on it when honed? If not it may take longer for the rings to seat On my 511 and 518 C.I. 400 stroker motors I ended up with two PCV and two breathers, one each on both valve covers
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Did the block have a torque plate on it when honed? If not it may take longer for the rings to seat 
