Piston Head design is important, but not as important as the displacement of the crown into the combustion chamber to increase compression. 8000ft high altitude pistons are about as high a compression as IH ever made. (I think) There ase sure to be custom pistons made for pullers that need valve relief and combustion chamber edge modification to fit with no interference. Generally the more plain the surface the better the flame propagation. Jim
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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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