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 - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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