Posted by JBlavl on April 08, 2014 at 10:31:25 from (72.46.228.155):
Started rebuilding my 1939 Farmall M some years ago and at the time did not have the proper tools to do a full head restoration. I took it to a guy who redid everything and when he was done told me oh yeah by the way this is a distillate head. Shame on me for not paying attention to that ahead of time as I may have opted to get a gas head instead. Oh well too late it's rebuilt. So now I am going through the process of rebuilding the rest of the engine and noticed it had stepped head pistons in it. These obviously was not the original pistons. I knew the engine had been rebuild as soon as I dropped the oil pan and noticed the rods and caps were not matching. I'm going to take a guess that a novice rebuilt this tractor at one point and didn't really know what they were doing. Anyway I am trying to figure out if I have a gas or distillate manifold. What are the differences I should look for? I assume this was run on gas after the rebuild seeing how it had the stepped pistons and no small starter tank or shutters on the radiator. My guess is they didn't spend the money to upgrade the manifold but I don't know what the differences were to verify this. Going forward I want to run this on gas so I assume the stepped head pistons with gas manifold are the way to go but can anyone verify if just putting this combination in place will result in what would be considered normal M compression and horsepower numbers? If it's going to be a complete dog I might tuck my tail between my legs and start searching for a gas head. Any and all info on the subject would be appreciated. Thanks in advance.
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