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Molnar Power Adder H-Beam Connecting Rods are designed for serious Power Adder Applications. Made from 4340 billet materialHeat treated to increase tensile strength and shot peened to increase fatigue lifeWear resistant bronze bushing for long wrist pin lifeARP2000 material bolts that are custom made for usAll MOLNAR TECHNOLOGIES connecting rods are finished here in the USA at our factory near Grand Rapids, Michigan.Sizes are held to +/- .0001″ which are the tightest tolerances you will find in the racing industry!5.850", 5.933", and 6.657" Center to Center LengthThicker beam Cross Section for Boost and NitrousThicker H cross section also strengthen the Rod’s Beam Area5.850" Big End Bore 2.125″ Sm. Chevy Journal (2.000")5.933" Big End Bore 2.239″ (Fits 4.6L and Coyote Engines)6.657" Big End Bore 2.239″ (Fits 5.4L Engines)Big End Width .940".866″ Pin7/16" ARP2000 Bolts