I have a set of spray bar V.C. that came with a set of Indy 440-1 heads that I bought that has Jesel paired shaft rocker arms on them, I tried to use my numbered drill bit set to see how big the holes are in them, a #60 bit was to big work Those lines are fed by a # 3 AN hose which is 3/16 I.D. I think
My wall chart shows a #60 bit to be .040 so the holes are smaller than that shruggy
I have another set of smaller numbered drill bits(61 to 80) in my race trailer but it is 45 miles away now with a customer car in it at a paint and body shop, I'm hoping I'll have it back by Friday to go race my car this weekend luck If you don't find out what size to use by then I will be glad to find out what size the holes are in mine up

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)