I have several older TRW and Perfect Circle engine parts catalogs at my shop in Nashville. They have a "specifications" section that gives dimensions of engine parts such as pistons, valves, etc. I was able to match up some valves for an older Oliver tractor that way, but we had to change the valve guide size. I'll check into possible interchanges when I get to work Monday.
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!