I cannot overbore, but I put LP pistons in my MF65 gasser for a 9.1:1 compression ratio. I did not own it when it ran the stock 7:1 so I am not sure what the difference is. I have a short vertical exhaust and she cracks clean. More power than I need and I haven't broke anything yet. I run 91 octane for peace of mind. I don't think it would detonate on 87, but I am not sure I could hear it over the exhaust.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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