Oliver farm tractor inline sixes are almost clones of the stovebolt engine, also. On one tractor engine I rebuilt, I used 235 valves and guides to replace the antique Oliver parts that were no longer available. The only noticeable difference was the diameter of the valve stems, and the Chevy guides fixed that problem.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!