Vacuum Pump Drive Pulley 40T- Radius Tooth

The Vacuum Pump Drive Pulley 40T Radius Tooth from MOROSO (MPN 23540) is a precision-engineered component designed for small-block and big-block Chevy V8 engine builds where reliable vacuum pump operation is critical to brake system function and overall engine performance. Built to OEM specifications with HTD (High Torque Drive) tooth geometry, this pulley maintains consistent belt tension and synchronization—essential factors that demand attention in any serious automotive or tactical vehicle platform where system redundancy and reliability cannot be compromised.

Manufactured from lightweight aluminum and finished in black anodized coating, the vacuum pump pulley features a 1/2-inch shaft diameter with the standard OEM 3-bolt mounting pattern, ensuring direct compatibility with factory vacuum pump assemblies on Chevrolet V8 engines. The 40-tooth radius tooth profile delivers smooth power transfer while minimizing slip and belt wear—critical for systems running under sustained load or in high-temperature engine compartments. Weighing just 0.89 lbs, the pulley maintains minimal inertial mass without sacrificing durability or precision timing, a balance that professional builders recognize as non-negotiable for long-term reliability.

This component is ideal for restoration projects, performance builds, and tactical vehicle platforms where original equipment standards apply and downtime cannot be tolerated. Installation is straightforward—the OEM 3-bolt pattern ensures drop-in compatibility with factory or aftermarket vacuum pump housings on most Chevy V8 configurations. Proper belt tension and alignment are essential during installation to ensure the pulley operates smoothly and the vacuum pump maintains adequate system pressure for brake assist and emission control functions.