Spring Pressures. Solid roller lifter on a hyd roller cam.

Yep, Different strokes for different folks
Pressures are grind dependent and imo
"Street" means different things to different people. Repeat, You can run much less depending on the grind.

My "street" engine sounds like a race engine....lol
However aren't there formulas that can be used to determine spring rate?

I noticed on IMM Engine website that they offer a spring upgrade kit for solid cams. They state that it's a double spring package..... so I doubt the single beehive spring (for hydraulic cams) is sufficient for solid lifters. Or is it?