Dayco PB1211ST Engine Harmonic Balancer

Dayco Street Performance Balancer PB1211ST

The Dayco PB1211ST Street Performance Balancer is an engine harmonic balancer built for Chevrolet high-performance applications that need neutral balance and accurate timing reference. It is a cast iron balancer with timing marks, a 3-bolt hole pattern, and no integrated pulley, making it a direct-fit choice for performance-oriented small-block and big-block builds that use this style of crankshaft setup.

Street Performance Balancer Line

Dayco’s Street Performance Balancer line focuses on performance engine applications where crankshaft vibration control and timing visibility matter. The PB1211ST uses a neutral, no-counterweight design with a cast iron outer ring and a 7.953-inch overall outside diameter, giving it the dimensions needed for select Chevrolet V8 combinations. The Dayco PB1211ST is also referenced by cross numbers such as Dorman 594-113S and Pioneer 872005.

Key Features

• Engine harmonic balancer for select Chevrolet performance applications
• Neutral balance with no counterweight
• Cast iron outer ring material
• Timing marks included for ignition setup
• 3-bolt hole quantity
• No crank trigger/exciter plate
• No integrated pulleys
• Crank bore: 1.599 in. / 40.60 mm
• Nose outside diameter: 2.333 in. / 59.25 mm
• Overall outside diameter: 7.953 in. / 202.00 mm
• Overall width: 2.686 in. / 68.20 mm
• Ring width: 1.871 in. / 47.50 mm

Detailed Description

The PB1211ST is engineered for Chevrolet engines that require a street performance harmonic balancer with neutral balance and timing marks. It is listed for 1966-1969 Chevrolet Bel Air, Caprice, Corvette, Impala, and Malibu; 1966-1967 Chevrolet El Camino; 1967-1969 Chevrolet Camaro and Malibu; 1969 Chevrolet Camaro, El Camino, and Nova; and 1970 Chevrolet Monte Carlo and Nova. Use this Dayco harmonic balancer when you need the correct crankshaft interface and a performance-style balancer for these specific high-performance applications.

What It Helps Address

• Crankshaft vibration control in performance engine builds
• Timing mark visibility during ignition setup
• Replacement of a worn or damaged harmonic balancer
• Fitment issues on select Chevrolet high-performance V8 applications
• Incorrect balancer dimensions on engines using a 3-bolt pattern

Installation Notes and Tips

• Verify crank bore, nose diameter, and overall diameter before installation.
• Confirm the engine uses a neutral-balance balancer with no counterweight.
• Check that your application does not require an integrated pulley or crank trigger plate.
• Inspect the crankshaft snout and keyway condition before pressing the balancer on.
• Follow the vehicle service manual for proper installation and timing alignment.

Quality Assurance

Dayco manufactures performance engine components with application-specific dimensions and timing reference features. The PB1211ST is built as a cast iron street performance balancer for the listed Chevrolet applications and is identified by part number PB1211ST for ordering and verification.