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Pistons are from JE, and carry P/N 216221. They were custom-crafted to Shaver's specs, including the 30cc dome and 11 equally-spaced gas ports to push the ring securely against the cylinder wall. They were designed to wear radial-cut piston rings. Ring thicknesses are .043-inch top ring, a 1/16-inch thick second ring, and a typical 3/16-inch thick oil control ring. View Related Article
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