Cab they make two differant adjusters one for pushrod oiling and one for spraybar, if you have pushrod oiling the adjuster is solid so it pressure oils the rocker shaft, if you have sprayber it is hollow so oil can bleed to the rocker shaft. I don't think it is a good idea to run hollow adjusters with pushrod oiling. I would run solid adjusters and let the spraybar cool the valve springs.

This set of Jesel rockers have no oil holes for the rocker tips or axles
They came with the heads along with the spray bar covers, the ratio on the box says there 1.55 ratio
I hope to race the motor this weekend at our local 1/8 mile track with out the spray bar covers do to no provision for the vacuum pump fittings, yet
I'll look at the rockers and valve springs after the first day and decide if I will run it the second day

I hope it doesn't burn up pushrod tips. T&D told me not to run there rockers that way.

Kool, let us know how that setup works out
for you Cab.

So if the pressure in is 50 psi in a .028 in3 line (3/16" ID), the pressure does NOT drop between the first and second set of holes? How about if the first hole is .028"? The line after that has the same pressure as the hole, and equal to 50% of the line in.
The delivery rate is a function of the hole area X the square root of the pressure differential.

I think you misunderstand what's being said here - although (my bad) I did leave out the word "combined" thinking people would be smart enough to assume that!:

" the "combined" area of the holes is equal to or smaller than the feed line they will all squirt the same amount (or pretty damn close to it)."

You didn't understand what I wrote.
Hydraulic engineering (Archimedes) figured this out 2 millennia ago in designing aqueducts.

Ok smarty-pants .... just tell him what size to drill the friggin holes !!

Equal hydraulic pressure at all points only occurs in a closed system without leaks.

Oops, ok what he said then.

My Indy valve covers were fitted with spray bars for the Jesel rockers. Oil lines were fed into the center of the valve cover. Helps eliminate end to end pressure drop and bleed off.

So when you plumb an oil pressure gauge in at the rear of the block, what its really telling you is the first main bearing is getting ridiculously high pressure and the last lifter in the left bank is getting virtually none

You'll need at least a dremel with a tiny collet to drill such a tiny hole.

Take a look at the heating duct work in a warehouse. You will notice how the duct diameters get smaller towards the end of the run. That keeps the airflow up when exiting the vents. Liquid works the same way.

Seems to me the pressure drop inside the valve cover if any would be insignificant
in such a short distance. I'm just saying.

My lawn sprinkler system has the same size line feeding the whole system. The last sprinkler sprays just as far as the first.

Agreed

And the holes are microscopic by comparison.

Kevin

Another way I've made spray bars is by using thick wall tubing. I use a paper thin Dremel cutting wheel and cut a slice into the tubing that just barely cracks through. Doing it that way makes a fan jet of oil. 1 properly position slice covered a pair of rockers.