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 - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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