1:1 Water Pump Pulley

The 1:1 Water Pump Pulley from ALLSTAR PERFORMANCE (ALL 31085) is a precision-engineered aluminum component designed for Small Block Chevy engines requiring direct 1-to-1 drive ratio water pump operation. This pulley maintains OEM-equivalent coolant circulation rates while accommodating V-belt drive systems common in classic and performance applications. Built for short water pump installations, this unit delivers reliable thermal management without compromise.

Manufactured in lightweight aluminum and finished in polished form, the 1:1 Water Pump Pulley features a 6.625-inch diameter with two V-belt grooves for secure engagement. The 1-to-1 ratio ensures that for every engine crankshaft rotation, the water pump rotates identically, maintaining proper flow velocity through the cooling system. This direct drive configuration eliminates over-spinning or under-spinning scenarios that compromise cooling efficiency. The polished surface resists corrosion while providing a professional appearance in engine bays with exposed cooling components.

Engine builders and Small Block Chevy enthusiasts benefit most from this component when upgrading or restoring cooling systems with non-standard configurations. The pulley pairs seamlessly with short water pump designs common in tight engine compartments or custom installations. Weighing 2.35 lbs and engineered to precise dimensions, this ALLSTAR pulley integrates directly into multi-groove V-belt arrangements without fitment issues. Installation requires standard pulley alignment and belt tension procedures; ensure proper centering on the water pump shaft for optimal belt life and cooling performance.