Upgraded Piston + Premium Ring Kit 99-07 4.7L CHRYSLER Aspen, DODGE Dakota Durango Ram, JEEP Commander Grand Cherokee MITSUBISHI Raider 16-Valve V8 SOHC Aluminum silicon pistons - Minimizes fractures and cracks High alloy steel rings - Withstands extreme heat More oil passage holes in oil ring groove - No more oil gumming up Shorten compression distance - For resurface cylinder head &/or block Oversized wrist pin diameter - Press to fit-Compensate loosened rod ends