For all my years setting up motors ,ring gap was always .004 per inch of bore,ex: 4 inch bore = .016 gap. The second ring was usually set up tighter and the thinking was it didn't see as much heat and expanded less . Speed Pro now says to open up the second ring gap to .020-.022 on a 4 inch bore. The thought is it allows gasses that get by the top gap to get out and not be trapped between the rings which causes flutter at high speeds and loads. Supposedly helps the top ring seal and even picks up a bit of power depending on application and conditions of course. I have an old school 327 SBC of my own I am putting together now and am going to try the bigger second gap on it.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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