SKU: COLDS-365-3
MPN: DS-365-3
The Pulley Upper Reduction 15% 3/4in Bore from Coleman Racing Products is a precision-engineered underdrive pulley designed primarily for performance enthusiasts and serious engine builders. This component reduces crankshaft pulley speed by 15 percent, which can lead to gains in engine efficiency and horsepower by minimizing parasitic losses from accessory-driven systems.
The pulley features a 3/4-inch bore diameter, ensuring compatibility with standard crankshaft applications. It is machined to exacting tolerances, maintaining dynamic balance to prevent harmful vibrations that could compromise engine longevity. The 15-percent reduction ratio is particularly beneficial for naturally aspirated engines, providing a balance between performance gains and the risk of over-stressing the serpentine belt.
Mechanics and engine builders often specify underdrive pulleys for various applications, including small-block Chevys and modern LS platforms. Weighing just 1.93 pounds, this component minimizes rotational mass, further improving throttle response and allowing your engine to rev more freely. Proper installation and application are crucial to ensure optimal performance and reliability.
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