Gees, just when I belive the old dog has learned a new trick, I find that I may not have it the wrong way. The reminds me of a boss i had that stated: "The only misstake I ever made was when I <span style="font-style: italic">thought</span> I had made a misstake but I had not."
The pivot acutally changes when the adjustment is made to the rocker and I understand the valve will not move (open) as much as it would if the pivot changes. The push is only 1.4 to 1 and a few thousands will make a tiny bit of difference even when multiplied by 1.4. But, with 80HP on the rear wheels, ever little bit helps.
Now in other words, if the head is cut then that does not mean the TR6 valve will open less unless shorter push rods are used. :confuse: and :crazy: