There used to be plenty of Ford Model A/B performance parts out there, and the Ford flathed tractor engines are very similar to those.
You can mill the head - a machine shop could tell you how much.
More displacement always helps, and more RPM's would help. A flathead is limited on intake and exhaust flow, so clean up the ports and relieve the valve pockets. I don't know if there are bigger valves that would work but that would help.
You'd need more carburetor long before you'd need more exhaust system, so 30% more power from a dual exhaust is not likely to work out. Look for a dual carburetor setup or a bigger carburetor. Buy or build some headers.
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Today's Featured Article - Women and Tractors, A Woman's Touch - by Teri Burkholder. I thought I would give you a little background on how I got myself hooked on tractors and their restoration. My family is a very "crafty" bunch of people. By crafty I mean good with crafts!! My Dad is a retired industrial engineer from Bucyrus Erie which made big shovels for excavating and he is also a wonderful wood worker. My mom and my "guardian angel" has had her own ceramic shop for 30 years and is an excellent painter. With these skills always active in our house it was hard not t
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