should be able to calculate that out by looking at the free length and spring rate.

"blueprint" specs were free length of 1.94", and spring rate of 365lb/in, so with the 1.6" IH I measured with the 3100 retainers, that would yield a seat pressure of 124lb, and a .5" lift pressure of 306lb.

the springs I had tested were 1.875" free length, 330lb/in, and the installed height (on my heads) will be ~1.6". so seat pressure should be .275*330, or 91 lbs, and .5" lift will be .775*330, or 256lb.

remember, coil bind was measured at .81" lift on those springs, (1.065") so .5" lift with my measured IH would only leave you .035" before coil bind. I think I'll probably use these springs, but I'll see about sinking the valves .030" or so (to gain IH), which will leave me ~.060 before coil bind with my cam. This seems like the most cost effective way, since I plan on getting a VJ done on them anyway, and I'll probably get a 5 angle 75/60/45/30/15 so sinking them shouldn't hurt flow as much with the 15 degree cut...I'd wager it'll add a CC or two to my combustion chamber, though.