Please Carefully check the Size of the Rods in Specific and Description Specification TÜV PRODUCT TEST AND TÜV ISO 9001 CERTIFIED Piston Bolt Hole: +-4/1000mm Power: 600hp ~ 800hp per set Strength of the fastening (PSI): 220.000/230.000 PSI Torque: 48ft ≈ 65 NM Top speed: 9000rpm Quantity: 4 Pieces a set Bolts: Including Genuine 3/8" ARP 2000 bolts (Note: Extra cost for upgrading to ARP L19 bolts) Material: Forged 4340 aircraft chrome moly quality steel for racing Weight Tolerance: Balanced to +/- 1 gram in set Application for Ford XFlow twincam BDA Cosworth BDG 5.23 Wide Journal Dimensions Center to center length: 132.84mm（Wide journal) Big end diameter: 52.91mm Small end diameter: 20.62mm Big end width: 26.8mm Small end width: 24.1mm NOTE: * Professional installation is highly recommended (Instruction Included. (If not, we could offer you the E-book version. )) * For any needs please contact us