Btw why would you bother cleaning up the casting flash on a cam/valley window when its not much to begin with ...and...you want the oil TO STAY ON THE CAM OR GO BACK TO THE PAN...and NOT shower the bottom of the intake with HOT OIL...i leave the flash there and use Valley baffle. A race block has some vents for crankcase pressure relief and for drian back, otherwise they close the valley to strengthen it.
