There is strong valid research indicating that a rough (as cast) surface flows substantially more than smooth ports. The idea is that micro turbulance at the tube wall produces less restriction than smooth laminar flow. Modifying the shape and smoothing the port has no effect at all unless the engine is approaching its volumetric flow maximum. Wjth the port sizes on a tractor engine that would be in the 3500 to 4500 RPM range (where an H would be swapping pistons in the holes)unless way modified. JimN
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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