Dayco PB1050ST Engine Harmonic Balancer

Street Performance Harmonic Balancer

The Dayco PB1050ST Street Performance Balancer is an engine harmonic balancer built for classic Chevrolet and GMC V8 applications that need controlled crankshaft damping and accurate timing reference. It features a ring-weighted counterbalance design, cast iron outer ring, and timing marks for straightforward setup on compatible street performance builds.

Key Features

• Dayco Street Performance Balancer line for performance-oriented engine damping
• Ring weighted counterweight balance for crankshaft vibration control
• Cast iron outer ring for durable construction
• Timing marks included for ignition and engine service reference
• 3-bolt hole design with a 1.245 in. crank bore
• Overall outside diameter: 7.953 in. (202.00 mm)
• Overall width: 2.343 in. (59.50 mm)
• Ring width: 1.523 in. (38.68 mm)
• No integrated pulleys, crank trigger plate, or woodruff key included

Product Details

Dayco PB1050ST is part of the Street Performance Balancer product line, focused on engine harmonic balancer applications where stable crankshaft control and timing visibility matter. The ring-weighted design and cast iron outer ring support consistent operation in older Chevrolet and GMC truck and passenger vehicle engines, including applications such as Chevrolet C10, K20, and Monte Carlo, as well as GMC Jimmy and G3500. This part cross-references Dorman 594-016S for the same application.

What It Helps Solve

• Crankshaft vibration in street performance and stock-style V8 builds
• Timing mark visibility issues during ignition setup
• Worn or damaged original harmonic balancer assemblies
• Fitment problems on 8 in. diameter counterweighted ring applications
• Service replacement needs for classic Chevrolet and GMC engines

Installation Notes and Tips

Verify crank bore, bolt hole quantity, and overall diameter before installation. This balancer does not include hardware, installation instructions, a crank trigger/exciter plate, or a woodruff key. Confirm pulley and accessory alignment, since this unit has no integrated pulleys. Use the vehicle-specific fitment notes for applications such as Fits 1976-1980 Chevrolet C10, N/A, Fits 1979-1980 GMC G3500, N/A, and Fits 1970-1975 Chevrolet Monte Carlo, N/A.

Quality Assurance

Dayco manufactures the PB1050ST as part of its Street Performance Balancer line for classic engine applications. The design includes timing marks and application-specific dimensions to support accurate service on confirmed Chevrolet and GMC fitments, including 1970-1980 model-year vehicles listed in the fitment data.