I was doing some reading on this subject and found out that I was calculating the valve spring pressure without taking into consideration the stepped retainer. I have dual springs and the retainer contacts the inner spring .100 before the outer spring. So after realizing this I re-calculated the pressures using the retainer instead of just the spring. With the same IH I was using the new Installed height pressure is 262 and open pressure using 1.5 rocker ration is 592 lb. Measured at 1.65 open is 642 lb. The lash is .016 and the lash was not taken into consideration when making these calculations.
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Tim Corcoran
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