Dayco PB1008ST Engine Harmonic Balancer

Dayco Street Performance Balancer PB1008ST

The Dayco PB1008ST Street Performance Balancer is an engine harmonic balancer built for classic Ford and Mercury applications that need stable crankshaft damping and accurate timing reference. It features a hub-weighted counterweight balance, cast iron outer ring material, and timing marks for straightforward setup on compatible engines.

Part of Dayco’s Street Performance Balancer line, this component is aimed at street-driven performance builds where consistent crankshaft control and reliable timing visibility matter. The PB1008ST is a direct-fit style harmonic balancer for select Ford Bronco, Mustang, LTD, and Mercury Cougar and Villager applications.

Key Features

• Engine harmonic balancer for select Ford and Mercury V8 applications
• Hub weighted counterweight balance for crankshaft damping support
• Cast iron outer ring material
• Timing marks included for ignition setup and verification
• 3-bolt hole design
• Crank bore: 1.374 in. (34.89 mm)
• Nose outside diameter: 1.878 in. (47.70 mm)
• Overall outside diameter: 6.339 in. (161.00 mm)
• Overall width: 3.012 in. (76.50 mm)
• Ring width: 0.765 in. (19.43 mm)

Detailed Description

The Dayco PB1008ST harmonic balancer is engineered for classic Ford and Mercury engines that require a balanced, timing-marked crankshaft damper. With a hub-weighted design and cast iron outer ring, it supports stable engine operation while providing a clear reference point for ignition timing. This part number, PB1008ST, is a practical choice for restorations and street performance builds where OE-style fitment details matter.

Compatible With 1966-1968 Ford Bronco, N/A; 1964-1968 Ford Mustang, N/A; 1965-1967 Ford LTD, N/A; 1967-1968 Mercury Cougar, N/A; and 1964-1967 Mercury Villager, N/A. This part cross-references Pioneer 872019 for the same application.

What It Helps Address

• Crankshaft vibration control on compatible engines
• Timing mark visibility during ignition setup
• Replacement of a worn or damaged harmonic balancer
• Fitment needs for classic Ford Mustang and Ford Bronco engine builds
• Service needs on Mercury Cougar and Mercury Villager applications

Installation Notes and Tips

• Verify crank bore, nose diameter, and bolt-hole pattern before installation.
• Confirm timing mark orientation during engine assembly.
• Inspect the crank snout and keyway area for wear before mounting the balancer.
• Hardware is not included, and installation instructions are not included.
• Use the vehicle’s service specifications for torque and alignment procedures.

Quality Assurance

Dayco manufactures the PB1008ST as part of its Street Performance Balancer line for classic performance and service applications. The design includes measured dimensions, a cast iron outer ring, and timing marks to support accurate installation on the listed Ford and Mercury vehicles.