They are rebuilding my 499 cubic inch indy headed engine. My old block ended being cracked after about 300 passes. I have indy heads with t&d individual shaft rockers. Oil was supplied to the heads through the pushrods. What oil mods should be done to the block if any? I just don't remember from the first build.

I am using the dual line swinging pick up from milodon.

What kind of RPM will you turn

I trap between 7200 to 7350 depending on weather conditions at the quarter mile. But I usually run 1/8 in south texas so I trap at about 6700 in the 1/8.

I will let the BB guys answer your question but that really
doesnt need anything special.. I will guess your using a roller
cam and lifters.. on the few BB that I did for high rpm I bushed
the lifter bores and drilled the main holes just to make sure
they didnt have any restrictions.. I use 5/8 groove main bearings

Yes that is correct solid roller and roller lifters.

The most important thing to check is the passages from the gallery to the mains. The factory often did a poor job of drilling those passages so you always need to run a reamer thru them to make sure they are open. But it is a dangerous job since if you break a reamer in the block then you've ruined the engine. I have a small collection of reamers so I can put one in there that just barely clears then slowly increase the size by 1/16th at a time until the passages are open.

If you have the money it is a really good idea to have the lifter bores bushed. But you need to find a shop that has the correct equipment to do it. The lifter bores need to be properly indexed which requires a rigid setup and precise locating. Getting all of the lifter bores in the correct location will add power. Reducing the oil leaks will also save a little bit of power by reducing the work the pump has to do as well as reducing the windage inside of the engine.

Thanks Andy!