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4.030" Bore x 3.750" Stroke, 6.0" Rod
KB 2 Valve Relief Flat Hypereutectic pistons are 390 alloy heat treated to T-5. Valve pockets and domes are fully machined and come with top land mini groves and second land accumulator grove. The low expansion rate and heat reflective properties allow for a tight running clearances increasing HP. All Hyper pistons can be used with pressed fit or floating pin rods. Ring pack B.