I went through this a couple yrs ago with the HS rockers. I checked the lift of HS 1.65 using light checking springs with a dial indicator and got a ratio of 1.78. However after installing the running springs the actual ratio dropped to 1.69.
I did the same test with my HS 1.5 s and got a running ratio of 1.56
The aluminum rockers flex a bit when fully loaded.
BTW: Test was done using CC valve springs with 350# at .560 lift
Larry
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