Junkyard 5.9L Magnum + Edelbrock LA heads build

nm9stheham said
FWIW, those larger holes around bottom holes 2 or 4, when a bolt is inserted, have a smaller flow area that the rocker oiling passage passage up through the LA head or block, or the oil passage through the cam. I suspect you are right in thinking you are going to use a far smaller flow area with the full oil pressure going into this feed. A .100" diameter restrictor would have an open area about 1/4 of the area of the more open shaft hole with a bolt through it, so the smaller shaft holes will be an even more noticeable added restriction. Just be aware it is there, so that something like the shaft shifting a bit when mounted does not come into the picture.

I look forward to seeing how this works out!

I had to think about that for a minute but I see what you're saying. Something I also have to consider is there will be oil supplied to the top end through the pushrods which might make it tougher to keep from over-filling the rocker space. If that becomes an issue where I "turn down" the oil supply to the rocker shafts but there's still significant flow out of the pushrods I may have to get solid pushrods. I like the idea of having oil pressure directly at the pushrod cups though, isn't that an area that sometimes needs attention on LA builds with big cams and valve springs? Smoking out pushrods and punching holes in rocker arms, etc.