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 - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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