[Formula8]

Originally Posted by Steve C.

Personally if it were my project I would verify the actual spring pressure, not guess. Measure them with their retainers in place at the actual measured and verified installed height on the cylinder heads with a Rimac machine. Never trust catalog stated pressures, they can and do vary.
.

I hear you and if the combination was untried, I would do that. However, many folks are running this exact cam with this exact spring in these heads at a marginally higher IH without an issue. So to some extent, whatever actual measured pressure they are at seems to work for others. I don't know if I would characterize using Crane's specs and using the calculations at your IH and open lift as a guess but I acknowledge, a measurement would be best.

Now I could run into a bad spring but they worked well with the previous cam and only have a couple hundred miles on them.