3-PLY HIGH TEMP SILICONE RADIATOR HOSE 69-72 CHEVY SBC CORVETTE 350 5.7L V8 BLUE Made with high quality silicone and 3-ply nylon for enhanced strength and durability. Increases engine performance and efficiency with high temperature (up to 330 Degrees Fahrenheit) and high boost application. 2 x Hose Inlet/ Outlet Inner Diameter: 1.75"/ 1.75" Hose Thickness (Approximate, Varies due to Bending): 3-Ply/ 4.00mm Size (Diameter) Tolerance: +/- 0.225" Application: 69-72 Chevrolet SBC Corvette V8 (Fits Automatic/Manual Transmission Models with 5.7L 350 Cu. In. V8 Engines Only). Modification might be required for some vehicles.