Belt Guide-3.5in Dia. w/ 1/8in Keyway & 1in Hole

The Belt Guide-3.5in Dia. w/ 1/8in Keyway & 1in Hole from MOROSO is a precision-engineered pulley guide designed to maintain proper belt alignment and reduce harmful lateral deflection in high-performance engine applications. This component is essential for builders and enthusiasts who demand reliable serpentine belt management, especially in supercharged, turbocharged, or heavily modified power plants where accessory drive systems operate under elevated stress and RPM ranges.

Manufactured from aluminum in a natural finish, this belt guide features a 3.5-inch diameter with a 1-inch mounting hole and a 1/8-inch keyway, providing secure fastening and precise rotational control. The 1/16-inch thickness balances lightweight construction with structural rigidity, preventing belt tracking issues that can lead to slippage, accelerated wear, and component failure. The guide's profile channels the belt into the correct path, minimizing edge loading and distributing contact pressure uniformly across the pulley surface for extended belt life and consistent power transmission efficiency.

Ideal for racing engines, street rods, and custom automotive builds, the MOROSO belt guide (SKU MOR23561) integrates seamlessly into serpentine systems where multiple accessories compete for belt real estate. Installation requires simple keyway alignment on the crankshaft or accessory shaft, and the compact 6.85 x 1.2 x 9.6-inch profile ensures clearance in tight engine bays. Whether upgrading an existing belt drive or engineering a new accessory configuration, this guide delivers the predictable, maintenance-free performance that serious enthusiasts expect. Sold as a pair for comprehensive drive coverage.