ooohh yes. first time i assembled my maxx block engine it was forever turning on the oil light just before the stripe. i had rung ICH & asked about whether these holes needed to be enlarged but they said no so i built it as is. next time the engine was out i enlarged the holes, this did improve the drainback as the light never came on till after the stripe & i was just starting to deaccellerate. at the stripe i could see the oil guage start to drop. next time out i chamfered the holes & made dividers. this was the trick for my engine, at a track i sometimes race at, it's an airstrip with over a mile of sealed surface. i raced one of my buddies to the 1/2 mile mark & the oil guage was hard on 80 psi the whole way. i figured the dividers allowed the oil to be seperated so there were more holes for the oil to return down & with all this excess oil i made a crank scraper to quickly rechannel it back to the pan. i think my holes are 5/8 since thats the largest drill in my collection.
