Larry, THIS HAPPENS AFTER IT WAS ALL PUT TOGETHER !! When the valve opens the OVER SIZE stem (which gets larger about 3/4 inch below the valve keepers) goes inside the seal and when it comes out (when the valves closes) peels out the seal. I am running about .550 lift and had to shorten the towers .250 Then cut for seals to cure this problem...What I have learned from this is not to wimp out on putting in new guides by reaming worn guides and using .010 oversize valves that I had on hand out of a 350 v/8 rebuilt motor. Us old folks have to watch our pennys !! SCRAP
