Coleman Pulley Upper Reduction 15% 3/4in Bore DS-365-3

A properly sized water pump pulley is critical for maintaining optimal coolant circulation and engine temperature stability, especially in high-performance applications where thermal management directly impacts reliability and power output. The Coleman 15% reduction pulley increases water pump speed relative to engine RPM, ensuring aggressive cooling when you need it most—whether you're pushing hard on the track or running a modified small block Chevy in demanding conditions. This bolt-on upgrade delivers measurable cooling benefits without requiring custom fabrication.

• 15% reduction ratio
• 7.000 in diameter
• 3/4 in bore
• 2-groove V-belt
• Aluminum construction
• Black anodized finish
• Short water pump mount
• Small block Chevy fitment
• Sold individually