ApplicationCompatible for BMW E30 M3 S14B23 1988 - 1991 L4Specification- Performance Con Rods- Type: Forged 4340 aircraft chrome moly quality steel for racing- H-beam Conrods Quantity:1 set of 4 pieces- Bolts: Including Genuine ARP 2000 bolts- Note: Extra cost for upgrading to ARP L19 bolts - Bolts Size: 3/8\" ARP 2000 bolts- Tolerance: Balanced to +/- 1 gram in set - 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 acceleration: 9000rpm - Warranty: one yearDimensionsCenter to center length: 144mmBig end diameter: 52mmSmall end diameter: 22mmBig end width: 24mmSmall end width: 24mmFeature- Forged SAE 4340 Chrome Moly Steel for the highest strength and durability, dedicated for Racing- Designed and processed by CNC machine.- All big and small ends are finished with SUNNEN honing machine- Precision alignment sleeves positively locate the rod cap, maintaining big end bore size and eliminating cap walk- 100% X-rayed, sonic tested and magnafluxed- Multi-stage heat treated- Shot peened to relieve stress- Come with the bronzed bushing suitable for the floating piston pinNote- Professional installation is highly recommended (No Instruction Included)- Custom Service:If there\'s no conrods you need on our site, we would be happy to help determine your requirements and develop a solution with you to satisfy your needs.