Hey flo I read somewhere to use .125 restrictors to the cam bearings. That is what I installed on a 512 im beginning to build. Is .125 too much. Should I change to .080 . This is a street strip car.

I cannot tell you if .125" is "too much". Stock there is no restriction at all and it works. The question is, how much more oil compared to stock do you want to direct to the mains and rods.

From all I found .080" should be enough to keep the cam bearings alive. I did NOT test it yet though! IF this is enough also heavily depends on the clearance of your cam bearings. If everything is really nice and tight there, much smaller should work. the otehr way around: if your bearings are really nice and tight you also do Not need a restritor ;-)

For reference:
Current Daimler 4 banger Diesel has ONE .080" (2mm) restriction for the WHOLE 16valve cylinder head:
That means: 10 cam bearings, 16 x hydraulic lifters and spray nozzles for cam followers.

Yes, there are 60years of manufacturing technology inbetween that motor and our B-Blocks, but just to give an idea.

Ok Thanks, this cam is tight in the bearings so I guess Ill keep the .125. Thats a lot smaller than the factory orifice

A new hemi block uses a .040 orifice to lube the 8 rocker arms.

The three new world cast iron blocks, wedge and Hemi, I've check had .039 restrictors in thier full time oiling passages to the rocker shafts I now use .039 restrictors on all my motors with Indy heads with external oiling on true needle bearing roller rockers Maybe a little bigger restrictor on bushed or non roller rockers like ductile iron or extruded aluminum with roller tips

I've seen good and bad math trying to proportion oil flow among many functions by relative restrictor size, but there is a limiting factor discovered eventually by anyone who does this.
A piece of grit will find a .030" restriction, and stay there. Even .035" is safer.