Safe rpm

Except hypers.No rules for Hypers. Hypers rule!
Ok, I'm kidding.
When I built my combo.in 98, I worked the formula backwards.Using the 3500 spec; (3500 x 6)/3.58 =5866. Well that sucks. There was no way I was gonna limit my 367 to that rpm.I couldn't find spec on hypers,so I arbitrarily went up the middle and started from 4500fps.
So (4500 x 6)3.58 = 7542 rpm.Can you imagine camming your street sbm to spin up there?Me either.I thought that was plenty of room
If you have hypers in your stock stroke SBM, it I think it's really hard to get to their limit.I guess that's why my 367 is still hanging in there.
With my current 230* cam, she probably peaks around 5500, maybe a little less. Adding 1200 for an auto powerband; that would then be; 6700 x 3.58)/6=3998fps..... I called it good. And it seems to have worked out for me.
But a Hypered stroker? (6700 x 4)/6 = 4467, is getting up there..............