General description These 4pcs Connecting Rods are designed for Mazda MZR and Ford Duratec 2.5 engines, crafted from forged 4340 aircraft chrome moly quality steel, making them ideal for racing applications. Each set includes genuine ARP 2000 bolts and is engineered for high performance, capable of handling power outputs between 600hp and 800PS. Technical specifications Type: Forged 4340 aircraft chrome moly steel Quantity: 4 pieces per set Bolts: Genuine ARP 2000 3/8" bolts Tolerance: Balanced to +/- 1 gram per set Piston Bolt Hole Tolerance: +-4/1000mm Power: 600hp ~ 800PS Strength of fastening: 220,000/230,000 PSI Torque: 48ft ≈ 65 NM Top acceleration: 9000rpm Dimensions: Center to center length: 151.76mm / 5.976" Big end diameter: 55mm Small end diameter: 21mm Big end width: 21.8mm / 0.859" Small end width: 17.9mm / 0.708" Installation Professional installation is highly recommended as no instructions are included. Other information Warranty: 2 years for any manufacturing defect