Quote: yes I realize that but the point is the holes are smaller than the other block manufacturers. making the indy block inferior in one of the most important areas of a block..oiling.
and I was wondering if anybody else was drilling them to match the bigger holes the other manufacturers have so I wouldnt have to add more external lines I believe the holes are smaller even than the factory block
on my first build i was running out of oil (12 quarts) on most passes, i had to overfill so i could make it to the finish. second build i opened them up a little more & restricted rocker arm flow. this improved things a bit, didn't need to overfill but still had to slip into N straight after a run as the pressure was dropping. third build i opened them up to 5/8(it's my biggest drill),no more running out of oil now, never seen more than 20 psi(rare) drop since the mod, but am planning to go dry sump in the near future.
