A few years ago, my pushrod length was off and I had to come up with something to make it easy for me to believe. My guy at the time said you could mark the valve stem and measure how far it walked across the valve stem and try to make it the minimum distance. I ended up making a dial indicator that was mounted on the valve retainer, and have the tip of the indicator against the center of the roller tip. It would measure how far it swept across the stem and I would have a number for a certain length pushrod. You change the length of the the pushrod and it changes how far it swept. Made it real easy. This was on stud mounted rockers. I picked up considerable et, and everything seemed to work. Now I got new heads with the valve cover rail real high and I can't use that tool for these heads. But I got my video camera and used it to look at the movement across the valve with different length pushrods and made my length off of what I seen in the video. i have seen a advertisement a few years back and it was called Off Your Rocker, and he sold a package with for a dial indicator that basically did the same thing. I am no expert, but I have seen other people ask mne what I did to drop the et and they ended up using it to find out where they were. Just think about what you are trying to do. I had to put in a lot longer pushrod and then put head washers under the rocker stud to get it up where it needed to be. It is fun when you can see the change.
