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Next, the JE/SSRE custom 10.5:1 forged-aluminum pistons are mated to the rod via the wristpin and fitted with the ring package. This particular customer will employ some nitrous, so the rings are being upgraded to Hellfire rings, which are ductile iron to handle heat and extreme cylinder pressure (having it your way). The top ring was gapped to .030-inch with the second at .032-inch to deter butting. A naturally aspirated engine would use a smaller gap, probably in the neighborhood of .022-inch.