Dayco PBU81480SS25 Engine Harmonic Balancer

Dayco Race Performance Harmonic Balancer

The Dayco Race Performance 8 Rib 25% Underdrive harmonic balancer is built for high-performance engine setups that need controlled accessory drive reduction and stable crankshaft damping. This unit is a direct-fit option for select 1998-2002 Chevrolet Camaro, 1998-2002 Pontiac Firebird, and 2004-2006 Pontiac GTO applications.

Part number PBU81480SS25 is part of Dayco’s Race Performance 8 Rib 25% Underdrive line, a product line focused on race-oriented accessory drive geometry. For buyers searching for a Chevrolet Camaro harmonic balancer, Pontiac Firebird crank pulley, or Pontiac GTO underdrive balancer, this part number identifies the exact configuration.

Key Features

• Engine harmonic balancer with neutral balance and no counterweight
• 25% underdrive Race Performance 8 Rib configuration
• Two integrated serpentine pulleys
• Outer ring material: steel
• Timing marks included
• Crank bore: 1.481 in. (37.60 mm)
• Nose outside diameter: 2.128 in. (54.05 mm)
• Overall outside diameter: 6.221 in. (158.00 mm)
• Overall width: 3.878 in. (98.50 mm)
• Ring width: 2.508 in. (63.68 mm)
• Installation instructions included

Detailed Description

Dayco PBU81480SS25 is an engine harmonic balancer with a steel outer ring, neutral counterweight balance, and timing marks for accurate setup. The dual integrated serpentine pulley design includes a 4-groove pulley and an 8-groove pulley, both at 141.000 mm outside diameter, supporting race performance accessory drive layouts. This configuration is intended for engines that use an 8-rib underdrive arrangement and require a balancer with precise crank bore and nose dimensions.

Compatible With 2004-2006 Pontiac GTO, N/A; 1998-2002 Chevrolet Camaro, N/A; and 1998-2002 Pontiac Firebird, N/A. If you are replacing a worn Chevrolet Camaro harmonic balancer or updating a Pontiac Firebird crank pulley setup, PBU81480SS25 provides the specified race-performance geometry in a single component.

What It Helps Address

• Crankshaft vibration control in performance engine builds
• Accessory drive speed reduction from an underdrive pulley setup
• Timing reference visibility during engine service and tuning
• Fitment issues caused by incorrect crank bore or nose dimensions
• Serpentine belt routing needs in 8-rib race applications

Installation Notes and Tips

Verify crank bore, nose diameter, pulley groove count, and overall width before installation. Use the included installation instructions to confirm alignment and timing mark orientation. Because hardware is not listed as included, reuse or source the required fasteners separately as specified by the vehicle application and service procedure. Confirm belt routing and accessory clearance before final engine startup.

Quality Assurance

Dayco Race Performance components are built for performance-focused engine applications where dimensional accuracy and repeatable fit matter. Part number PBU81480SS25 is specified for select Chevrolet Camaro, Pontiac Firebird, and Pontiac GTO applications with the listed underdrive configuration.