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 - Diagnosing Engine Difficulty - Diesel Tractors - by Staff. The following suggestions are listed for your assistance. You can make simple adjustments on your tractor that will improve its operation and save you the time and expense of hiring someone to do it for you. Always make one adjustment at a time, and if the adjustment made does not improve the condition, return to the original setting before proceeding to the next adjustment. Hard Starting Cold air temperatures. Insufficient fuel.
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