W2 head installed valve spring height

PRH said

For the SB oval track stuff we were building, running fast rate SFT cams, I ran quite a bit more open load than 330lbs.

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Oval track. Yes.
I was vague, Street motors require less open is what I was getting at.

Like usual all depends on what you're doing if you're going to rev it higher and more often you going to want some more pressure to control it.