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Eagle Specialty Products works closely with Mahle on most of its stroker kits, and our 598 is no exception. Because McAfee is maximizing power, he opted for low-friction rings that are narrower than most of us are used to. This ring package is 1.5mm, 1.5mm, and 3.0mm for reduced friction. A support rail keeps the oil ring package stable. Turning thermal energy into rotary motion is a 6.80-inch center-to-center 4340 H-beam rod with ARP cap screws.