Max Valve Spring Pressure for Reground Camshaft

I have run as much as 140 on the seat on my street cars with
no issues for a number of years with a quality CWC cast iron
cam. I never use the new Chinese cams in anything. I would rather
regrind the cam when there is enough left on the lobe to do so.

However, I never let the cars sit idling for more than a minute or
two without shutting the engine down in any of my cars.