Well, the original 460 had stepped pistons and apparently some one put in fire crater style pistons in the other. When IH came with the 706 they used the fire crater design for better effeciency and were using that design for replacement in 221 engine and most of their engines if you so desired. One thing though, they used less spark advance with crater style as it changed the rate of combustion. The first 706 tractors used a 25 degree advance distributor which was to be timed at full throttle to 22 degrees advance, but they soon changed to a 22 distributor and had a gasoline engine improvement package that also came with a new distributor. Put several pkgs in 706. I guess I never did put crater type pistons in a 221 until I used Hy Capacity sleeve set after I "retired".
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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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