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The rings were sealed to the bore by Sealed Power piston rings, in .043 (top), .043 (second), and 3/16-inch (oil) thicknesses. The top ring was also designed with a .155-inch radial depth. The skirt, being longer than normal, kept the piston nice and straight in the bore, and at +.010-inch deck clearance (.030-inch total piston to head), the pistons never hit the head. The ring stack needed to start at .450-inch down from the deck because the relief ground in the cylinder wall for the exhaust valve extended .400-inch down.