Solid roller lifters...

Bewy said

A few comments.
- doubt that rocker arms are causing a 30 psi oil pressure loss [ unless using veeeeeery thin oil ]. I would be looking elsewhere. Factory oil pumps are over-engineered to allow for eventual engine wear & STILL provide adequate oil pressure.
- don't know where this nonsense about bushing lifter bores comes from. I presume you are using a used block & it provided 000s of miles of trouble free running with the existing bores.
- if the engine size is 440 or less, that cam will be a dog on the street
- lifter oiling for needle roller lifters. Another con job, like oil/FT cam failures. It is an engineering FACT that needle/roller brgs survive on minimum oil. HD, the inventor of needle roller lifters, did not provide pressurised oiling to the lifters & they last forever. Examples abound of roller brgs lasting 000s of miles on scant lubrication, u joints, wheel brgs, alt brgs to name a few.
- I would only used bushed lifters & the best that you can get. Isky comes to mind...A bushing type lifter DOES need a pressure wedge for lubrication. It works like the rod/main brgs.

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You are correct, I have BIG main and rod bearing clearances and constant oiling to the top end with indy heads, all this causes lower oil pressure, but its 70+ psi from 2500 so I can live with it.
Its like this since I built it.
Engine in 11:1 470 and my street driving is not really sitting in traffic, its 7000rpm from light to light hoping cops dont see me. I have other cars to drive like grampa ;-) This is driven like its stolen most of the time. I also have 5000 stall converter in this car...
I am tempted about bushed iksy lifters but its 1500$ and I know people that use 829 for 10+ years with one rebuild and bigger overall cams than mine, at this price point 2 sets of 829 are 1200$ and when I talk to Isky and others about street driving with bushed lifters they just say its a competition part, they dont know and say needle bearing could work also. Bigger wheel size seems like a good idea though 812" vs .750.
I think the biggest problem is too weak spring, roller gets hammered by the cam and this gets you in trouble. I saw 15% open pressure drop on spring in 3 seasons time. They went from 620lbs installed to 530lbs and killed cam + 3 lifters. Damage was consistent on all the lifters.