General description Please carefully check the size of the rods in the specific and description specifications. These Forged 4340 EN24 Connecting Rods are designed for Ford Cosworth YB Sierra Escort RS, providing a power capacity of 600hp to 800hp per set. Each set includes 4 pieces and comes with genuine 3/8" ARP 2000 bolts, with an option to upgrade to ARP L19 bolts at an extra cost. Technical specifications Material: Forged 4340 aircraft chrome moly quality steel Weight Tolerance: Balanced to +/- 1 gram per set Center to center length: 136.5mm Big end diameter: 55mm Small end diameter: 24mm Big end width: 25.9mm Small end width: 25.9mm Installation Professional installation is highly recommended. Instructions are included, and an E-book version is available upon request.