My take on the oiling system crossover tube for the small block

Few questions:

Wouldn't I need to bush the lifter bores to do that? Which would also require dismantling the shortblock?
If bushing is not necessary, who makes the solid roller lifters that would drop right in?
Would they work with my hydraulic roller cam? or does the cam not care if the lifters are solid or hydraulic?

First of all I have watched your videos. The oil pressure response is what tells me something , not the actual number. I don't like what I see. You have an oil plug missing (best case scenario) or excessive main bearing clearance. The way it lags behind RPM changes is not a good sign. It is probably gushing oil around the lifters as rollers are usually -.001" smaller which is quite a bit of area but the way it responds is the tell tale. Good luck. J.Rob