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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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