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 - Restoring a John Deere 2010 Diesel Tractor - by Jim Nielsen. Following seven years working in California's Silicon Valley, my wife, baby son and I moved back to Australia to retire. We bought a small 'farm' of about 50 acres near Bendigo, in the state of Victoria. I soon found that it would be very useful to have a tractor around the place for things such as grading our long drive and brush-hogging the fields. I was also embarking on planting 1000 eucalyptus trees, and hence I would need a ripper, small disk plow, sprayer etc. to get these things accompli
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