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Just needing confirmation as where to measure valve open points not sure if it’s pushrod or valve retainer
tia
With that card, it should be at the follower/lifter. If the pushrod is aligned correctly, in line with the follower, it can be much easier to use it as an extension.
It's a hydraulic cam' and you may find it much easier to do it correctly by using a couple of mechanical followers, to double check on both in'and ex', or machine a couple of blanks.