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 - Bad Vibes - by Curtis Von Fange. One of the strangest ways to communicate with our tractor is to ask it how it feels. "Ask it how it feels," you say? Yup, ask it how it feels. Now, as with the other articles in this series one has to be able to hear what 'ole blue' is trying to say in response. The nice thing about our old iron friends is that they are usually quite consistent in their response, rather unlike some people I know who might change what they say due to the weather or other mitigating circumstances. But since t
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