Rocker geometry has always intreged me. Having stated with a 216 then going to a 270 GMC in the 60's. Never being able to afford the best "stuff" I inched along with stock rockers for years. With the advent of higher lift cams; the welding of stamped steel ones was necessary. I continued to replace guides because of the pushing effect of the stock rockers.
The decision to make roller rockers was easy, the building more difficult for a low budget racer. Finding a shop to machine my design for the rocker and stand did come however with a trade of some electrical work for the basic parts.
Purchasing roller tips from Isky was accomplished buy promising only 16 were to be made. Chrysler adjusters were bought at a swap meet. Torrington bearing were bought from the now defunct King Bearing and I now had roller rockers. They ended up 1.63 to 1 and have never failed. I have run the same guides for over 10 seasons and they used to make 2.
If making rockers for an GMC inline remember they are almost vertical and parallel to the valve.
The fun is having your own set and aaccomplishing something not store bought. I glad some are now available...Good Luck
