Mopar R1 block

See the post Rumble made above.

If you aren't going to bush the lifter bores, make sure you tube the passenger gallery and block the oil off to the drivers side. If you are doing pushrods oiling, you can still do it, you just need to drill a .0625 hole in the tube for each lifter on the passenger side and restrict the oil to the drivers side with about a .187 or so hole and you'll be pooping in the tall cotton.
I did manage to use a solid body comp cams roller lifter in my latest w2 engine, going in late this month, after vacation, no oil pressure issues at all, as long as you don’t puke a lifter.
I would go through blocking oil or big time restrict it, if I hadn’t used this style lifter.
I will heed your warning though, as I have no intention of wasting a good engine.