40 lbs at installed height, 200 lbs at full cam lift. So 160 lb springs.
In order to get the hole that is under the rocker arm to get oil of top of the valve retainer I had to mark and drill the shaft at full valve lift, and it's still boarder line.
Just saw this.. something is wrong in the installed height force measurement above; the stock springs were in the 60-80 lb range at installed height....???!
If that measurement is correct for the installed height, then these are the wrong springs.
And you don't spec spring rate by the closed-to-open-valve force difference....you take that difference and divide by the valve lift ( which is the spring compression closed to open). For example, if you did get a 160 lb difference closed to open, and the lift was .500", the spring rate is 160/.500" = 320 lbs/inch.