87 Octane should work fine in your Farmalls. Hi Octane gas is not needed in a low compression tractor engine. Also you don"t need any lead additives. Studies and testing have shown that valve seat recession running no lead gas only happens in high RPM engines. Since most gas tractor engines are low RPM, you will be fine. If you have access to non ethanol gas, you will be way better off using it. If you are in a humid climate, the ethanol will attract moisture and cause corrosion in your tank and carb. The ethanol can also cause various rubber compounds on carburetor parts to soften or swell up and fail. I just rebuilt a carb yesterday that had failed in this way due to ethanol gas. If you have to run an ethanol gas, I would recommend draining your fuel tank and carb float chamber if you need to let it sit more than three weeks.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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