Hey Bill, I've been doing it that way ever since I bought my first 4 cycle in 1977. The old Open Rocker OSFS60. The very first one with the machined head and rockers. I am flying a Pilot Sky Loop 404 with a Saito FA45 with the bolt on head. It was purchased in 1979. It has been in almost continuous use since it was new. Couldn't tell you how many gallons of HShack's White Lightning fuel have been through it. The only thing ever replaced on it were the bearings and that was last year. That is 26 years. The valve train is in fine condition. How long should they last? I would say that 26 years speaks for itself. They way I do it does have the minimum clearance.

AMA13797