I tried an MSD on my U puller and couldn"t make it work. I just run Autolite 3116 with a pertronix ignition and it runs great. I tried everything with the MSD, 100"s of different plugs, wires, timing and nothing worked as good as original. I am 12 to 1 compression with several extra cubic inches.
How ever I put MSD on large cubic inch Farmall M on racing gas and it works wonderfull. Put it on a ford 460 pulling truck and it works great, just couldn"t make it work on my tractor. Might be the fuel but there is guys running them on propane. So Only one way to find out for sure is to try it.
 
We have successfully ran msd ignition boxes on propane engines for years. Propane requires good ignition components as gaseous fuel is harder to get to light than a liquid fuel. MM tractors have not ever been accused of having overly powerful ignition systems. Have you ever noticed how most MM LP tractors will have a random misfire at idle? This is caused by a combination of issues which is worsened by cold spark plugs. In our experience msd boxes have completely cured these issues. I would recommend a more powerful coil as well. We have had good luck with a late 80's Ford E coils. The msd box will not increase available voltage to the plugs but will provide a multiple spark discharge (MSD). This allows more oppurtunity for the plug to light off the fuel mixture in the cylinder which helps eliminate misfires. I would further recommend upgrading to electronic ignition over points and verification of your ignition timing. As I recall the msd will move your timing a little. The upgrade from points only helps accurate timing events,(we ran a 1355 w msd and points for years). I hope I havent been to long winded. Feel free to email or call or text with any other questions [email protected] 309-944-7301 Eric
 
msd will give more spark and a stronger spark but no more hp. as for the u puller i ran a msd on my u that was 570 cubes with big compression and it ran great. i ran autolite 373 plugs
 

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