Question for those who have used Speedmaster assembled heads or valve springs

GTX JOHN said
I run at least 140 lbs on my Street Cars that have solids and 350 lbs open
with no issues for the last 60 years. More on my Race Cars than that.
However, I do NOT let my car idle for any extended period of time ever =
Just shut them off if more than a minute or two.
However, I use quality CWC cast camshafts and not the new Chinese junk!

Well this is not something that I am going to be shutting down during idling. Are you just trying to avoid valvetrain wear? Or is it because the pressures of the valvesprings are actually too much for what youre doing?

As far as the cam goes, the cam im sending for regrind is an 90s crane grind, so im thinking im good on the quality end of things in regards to the core.

pittsburghracer said
I never ran a set but there’s about three days of reading in the speedmaster sticky post.

Yea im trying to avoid going near any of that as a lot of those threads are conversation back and forth not really pertaining to the topic and take an eternity to find info lol.

I know you had mentioned before that you had a set of the assembled hydraulic roller heads for a customer, did iu by chance test the springs? Were they pretty close to the advertised specs for them?