Belt 27mm SBC +.391/ .434/RHS LS

The JESEL Belt 27mm SBC +.391/.434/RHS LS is a precision timing belt designed for serious small-block Chevrolet and LS engine builds. This component is essential for engine builders and performance enthusiasts who require reliability in high-revving applications, particularly when using aftermarket belt-drive systems that necessitate specific idler and tensioner clearances.

Manufactured to exacting tolerances, this belt utilizes reinforced elastomer compounds and high-strength cord construction to resist stretch and heat degradation during continuous high-RPM operation. The 27mm width indicates its tooth profile and drive surface geometry, while the critical +.391/.434 specifications refer to idler offset dimensions and right-hand serpentine orientation, which must align precisely with your installed hardware.

Ideal for street performance, bracket racing, and engine dynamometer testing, this belt ensures proper tracking and load distribution across all driven accessories, including Roots superchargers, alternators, and water pumps. It is specifically compatible with small-block and LS platforms, making it a vital component for custom engine packages where OEM serpentine systems are inadequate.