JE Pistons JC1806-3661 Piston Ring Set 3.661 in. Bore 0.0591 in. Top / 0.0591 in. 2nd / 0.118 in. Oil 6 Cyl.JE Pistons JC1806 3661 Piston Ring Set 3. 661 in. Bore 0. 0591 in. Top 0. 0591 in. 2nd 0. 118 in. Oil 6 Cyl. JE Piston Rings are designed to maximize horsepower through precision sealing of combustion pressure. They are offered in a huge selection of sizes, various materials, and in multiple thicknesses to suit a wide variety of engines. JE Pistons also offers an array of custom piston ring services including back cutting, dyke cutting, lapping,