Externally oiled head restrictor size.

My guess is 11/32 is for a LA block/head combo oil mod? Since that is a timed arrangement, (hole in cam lines up w/ hole in block) you are adding some volume. With a constant feed, I’m thinking you will have a retention pond going on up on top with an 11/32 “restriction”.
I’m thinking we are looking in the neighborhood of 1/8 (or maybe even less). IF we are talking about the same thing, though I’ll be the first to admit that I often misunderstand where the conversation is going.