Me and my dad went through our old '49 M a few years ago and we ended up doing the 4 1/8" bore. We ended up putting a 450 head on it being the original had 6 cracks, and numerous welds in it. The last time I dynoed the old girl, it was putting out around 66 to 67 horse on 87 octane/unleaded gas. If you want to make power without going the route of stroking an engine, doing work to the head and finding the highest compression piston is the best way to do it. Best of luck with your project!
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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