Hi Dennis,
I am glad the flag still flys. Please bring it to Columbus this year if you come.
Doug T.
P.S. I couldn't remember the thread pitch on the rocker adjusters, are you guys sure it is 20 and not 24 TPI? Anyhow that doesn't matter as much as the fact that I forgot the rocker ratio needed to be included.
I have in fact gotten 2 old Y's running quietly by pulling the rocker shafts and then grinding the face of the rockers with an angle grinder so that the wear surface was flush with the ground surface. That way a feeler gauge can be used. It sounds a little rough and ready but both engines ('64 & '56 Pickups) gave many thousands of miles service after that treatment.
Doug T
The Highlands, Louisville, Ky.