ZRP Forged Connecting Rods SpecificationsWith more than 50 years of engineering and machining experience ZRP produces ultra-high performance engine internals for competition at excellent value. The brand offers connecting rods crankshafts forged pistons and stroker kits that are ideal for tuning strengthening and making your engine more reliable. ZRP parts have superior high-temperature and stress resistance compared to OE components and allow you to get the most out of your mechanics over a long period of time.These forged I-beam conrods for Ford N5B and YB engines are made from the highest quality 4340 steel and feature an optimized shape to ensure high performance and extreme strength. The conrod bushings use AMPCO 18 alloy for excellent wear and fatigue resistance and have a radial groove acting as an oil reservoir. They are shot peened to reduce material stress and undergo a multi-stage heat treatment to increase rigidity.Each set comes with ARP 2000 fasteners capable of withstanding 220 000 psi (15 000 bar). ARP L19 fasteners rated at 260 000 psi (18 000 bar) are also available as an option. Fitting instructions included.