General description Please carefully check the size of the rods in specific and description application for Triumph Spitfire 1500 1.5L I4. This set includes 4 racing connecting rods made from forged 4340 aircraft chrome moly quality steel, designed for high performance and durability. The rods are TÜV PRODUCT TEST and TÜV ISO 9001 certified, ensuring quality and reliability. Technical specifications Type: Forged 4340 aircraft chrome moly quality steel Quantity: 4 pieces per set Bolts: Genuine ARP 2000 5/16" bolts (upgrade option available for ARP L19 bolts) Tolerance: Balanced to +/- 1 gram in set Piston Bolt Hole Tolerance: +-4/1000mm Power: 600hp ~ 800PS per set Strength of fastening: 220,000/230,000 PSI Torque: 48ft ≈ 65 NM Top acceleration: 7000rpm Warranty: 2 years for any manufacturing defect Dimensions: Center to center length: 146.05mm / 5.75" Big end diameter: 51.34mm / 2.021" Small end diameter: 20.637mm / 0.812" Big end width: 22.8mm / 0.898" Small end width: 18mm / 0.709"