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[Ridgerunr]

"#175 lbs are not considered heavy springs."

Agree. For most street machines, should be fine.

I don't have the expertise you guys that do heads for a living have, I'm relating my experience. The 175# springs in the HTCC heads I mentioned earlier, had over 50,000  hard miles on them.

[HILLSIDECYCLE.COM]

All of our Stage III and Stage IV Heads come standard equipped with .650" AV&V springs, from Goodson.
BTW, FWTFIW, we are currently manufacturing an HD cylinder head fixture(that I've used here now for over 20 years) for Goodson, to be sold exclusively thru them.
Handy multi-use tool.
Scott

[HD Street Performance]

I make my own tooling and currently working on an airfloat table fixture. Maybe goodson wants that.
175# is just a number out of context of the spring rate and what the pressure is over the nose at maximum lift. In other words it may be high or it may not. Plus 175# and lets say 400 over the nose may be spot on for a 2+ inch heavy valve head expected to hit 6500 but the same pressure for lighter valves would be overkill.

[HILLSIDECYCLE.COM]

Sell it to them.........