Single Upper Lwp Pulley

The TRANS-DAPT Single Upper LWP Pulley (Part Number 9482) is a precision-engineered water pump pulley designed for Small Block Chevy engines requiring OEM-specification cooling system performance. This aluminum pulley features a single V-belt groove configuration and a 6.625-inch diameter, delivering reliable power transmission for long-style water pump applications. Constructed from machined aluminum, it provides the durability and accuracy necessary for both stock restoration and high-performance engine builds.

The 6.625-inch outer diameter is critical for maintaining proper belt tension and drive ratio across the serpentine belt system, directly influencing water pump flow rate and engine cooling efficiency. Machined aluminum construction resists corrosion while keeping rotating mass minimal—a factor that reduces parasitic engine load and improves overall system responsiveness. The single-groove design accommodates standard V-belt fitment on long water pump configurations, ensuring compatibility with aftermarket and OEM belt routing. Precision machining tolerances ensure concentricity, preventing vibration and premature bearing wear in the water pump assembly.

This pulley is engineered for builders and mechanics working on Small Block Chevy engine platforms—whether restoring a vintage muscle car to original specifications or assembling a modern performance engine using classic displacement architecture. It serves as a direct replacement for factory pulleys that have developed runout, cracking, or bearing damage. The part's lightweight aluminum construction makes it a standard choice for applications where engine bay weight reduction matters, from street rods to marine inboards where engine compartment thermal management is demanding. At 1.53 pounds, the pulley integrates seamlessly into long-pump cooling systems without requiring additional modifications.