Dayco PBU1190SS25 Engine Harmonic Balancer

Dayco Race Performance Underdrive Harmonic Balancer

The Dayco PBU1190SS25 is a race performance engine harmonic balancer built for GM truck, SUV, and performance applications that use a 3-bolt crankshaft pattern. Its 25% underdrive design reduces accessory speed while maintaining timing mark visibility and a neutral balance configuration for the listed fitments.

Built for Chevrolet Silverado 1500, GMC Sierra 2500 HD, and Camaro applications, this harmonic balancer combines a steel outer ring with dual integrated serpentine pulleys. The PBU1190SS25 is sized with a 6.221-inch overall outside diameter, 4.528-inch overall width, and a 1.481-inch crank bore, making it a direct-fit performance replacement for compatible GM engines.

Key Features

• Dayco Race Performance 25% Underdrive line for reduced accessory drive speed
• Neutral balance design with no counterweight
• Steel outer ring for durability in performance use
• Two integrated serpentine pulleys: 4-groove and 6-groove
• Timing marks included for service and setup
• Installation instructions included
• 3-bolt hole quantity with no crank trigger/exciter plate
• Part number PBU1190SS25 for ordering and fitment verification

Product Details

This Dayco harmonic balancer is part of the Race Performance Underdrive product line, which is aimed at applications where accessory drive reduction is desired without changing the basic crankshaft interface. The PBU1190SS25 uses a steel outer ring, neutral counterweight balance, and dual serpentine pulley integration to support GM V8 and related platform fitments across trucks, SUVs, and performance cars. It is listed for Chevrolet Express 2500, Silverado 2500 HD, Tahoe, Suburban, Camaro, GMC Sierra 1500, Yukon, and other GM models from 1999-2020. If you are searching for a Dayco PBU1190SS25 harmonic balancer for a Chevrolet Silverado 1500 or GMC Sierra 2500 HD, this part matches the specified applications.

Common Uses

• Replacing a worn or damaged engine harmonic balancer
• Restoring crankshaft pulley alignment on GM truck and SUV engines
• Addressing timing mark visibility during engine service
• Supporting underdrive accessory setup for performance builds
• Correcting vibration concerns related to a deteriorated balancer assembly

Installation Notes

Verify crank bore, bolt pattern, pulley groove count, and overall dimensions before installation. This part uses a 3-bolt pattern, includes timing marks, and does not include hardware or a woodruff key. Installation instructions are included, and proper torque procedures should be followed during assembly. Confirm the vehicle’s accessory drive configuration before ordering the PBU1190SS25.

Quality Assurance

Dayco manufactures this Race Performance harmonic balancer for the listed GM applications with a steel outer ring and neutral balance construction. The part number PBU1190SS25 is intended for direct application matching on supported Chevrolet, GMC, Cadillac, Hummer, Buick, Saab, and Isuzu models.

Compatible With: 1999-2020 Chevrolet Silverado 1500, 2001-2019 Chevrolet Silverado 2500 HD, 2000-2014 Chevrolet Tahoe, 2000-2014 GMC Yukon, and other listed GM applications.