Well every F series motor I've ever had apart has the same size intake and exhaust valves. The F30 valves are one part number apart, my 2 F12's all the valves are the same part number. The F12 book lists an intake valve but lists the exhaust valve as exhaust/intake valve. These old girls may be before stellite's time. They were also made to run hot to burn kerosene, and do it all day long, so your spare good intake valves will probably work just fine.
just found my 1929 10-20 parts book, they originally had intake valves 10891D but the parts book says order 10893D intake and exhaust valves. It also list 8064T as Intake/exhaust valves. They are silichrome not stellite. So yes they are the same size and yes you can use them. There was also an oversized valve 12297D intake and exhaust valve (silichrome) for repairing worn heads
This post was edited by 36F30 at 21:52:58 07/08/11.
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