Since the timing is controlled by the ECM, the only way to change it is to reprogram the ECM. Good luck on that one. However, there are a few other thing to take into account. First thing is that there may not be as much difference in the fuel as you think. Second is that timing may not be that critical. You only have it on hearsay that it should be changed. Knock sensors are an amazing thing. Third is that I also question the availability of the gas volume for the natural gas. Two years ago, our local gas company came through and upgraded and lined all of the gas lines in my neighborhood. I had the opportunity to talk to the men doing the job. What I learned is that they run 50 to 60 psi in the 2-inch mains. This pressure is maintained all the way to the meter, where it is regulated before entering the meter. Since appliances that are designed to use natural gas seem to be universal, I would think that the gas pressure is set to a STANDARD, and is therefore compatible throughout the entire country. Likewise with appliances set up to use LP or propane. I see very little potential for long term engine damage. My suggestion is to use it, enjoy it, and don't believe everything that you are told.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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