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Urban has spent many years building engines and one facet of knowledge he has gained has been on where to place the gaps of the rings on the pistons--a process known as "timing the rings." You see the Top Fuel guys doing this right before they stick a piston in a bore on TV. For this engine, Urban placed the ring gaps for the top ring and the oil expander gap facing the non-thrust side of the piston, and the second ring gap and the oil rails are clocked on the thrust side. View Related Article
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