Do i really have to explain what happens when you put more volume to the same size hole as std...the psi just might go up, the oil might even run a higher temp..huh... how about those worn lifter bore that bleed off extra oil, if the lifter end is pissing away the pressure.. well... 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. IQ said where the volume gonna go with the same clearances...? I completely get where he is coming from, but only in a perfect world maybe....How about the worn lifter bores? the full groove main bearings? the bigger rod clearance .0021+? How about these goof balls drilling holes in the lifter galley plugs? The rear lifter galley plug to oil the intermediate shaft...Lol use your imagination. Plenty of places that could use the volume. Nothing is new and stock, and people have their ideas they throw around and implement. Stock m72 is all you need till you hit 7500+rpm ..then you need to look into changing some things. Do you need a hv pump? NO! Do you need to tap the galley plug to squirt oil on the intermediate? NO! Do you need to squirt oil psi on the chain? NO! Do you need a pan baffle with any pump?YES!!! One poster went to boast his std pump with hp spring fixed his problem...then mentioned "hemi pan'"... thats a baffled pan. Thats what fixed your problem imo.