Dayco
Street Performance Balancer

Dayco PB1012ST Engine Harmonic Balancer

Brand Dayco PB1012ST
Bolt Hole Quantity 3
Counterweight Balance Neutral, no counterweight
Crank Bore 1.245
Crank Bore 31.62
Crank Trigger/Exciter Plate No
Hardware Included No
Installation Instructions Included No
Nose Outside Diameter 1.766
Nose Outside Diameter 44.85
Number of Integrated Pulleys 0
Outer Ring Material Cast iron
Overall Outside Diameter 154.50
Overall Outside Diameter 6.083
Overall Width 2.343
Overall Width 59.50
Ring Width 1.299
Ring Width 32.99
Timing Marks Yes
Woodruff Key Included No
Product line Street Performance Balancer
Fits Chevrolet, GMC, and Pontiac · 261 vehicles

Neutral balance design. No counterweight for a straightforward harmonic balancer setup.

Cast iron ring. Durable outer ring construction for engine vibration control.

Timing marks included. Built for accurate ignition and service reference.

Cross-references Dorman 594-156S, Pioneer 872001 and Pioneer DA-3270HD for the same application. See all 3.

$173.37Free shipping
In stock · usually ships same day before 1pm CST
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Street Performance Harmonic Balancer

Dayco PB1012ST is a street performance harmonic balancer built for classic Chevrolet, GMC, and Pontiac applications. It uses a neutral balance design with a cast iron outer ring and timing marks for accurate engine setup.

Key Features

  • Neutral balance design with no counterweight
  • Cast iron outer ring for durable engine damping
  • Timing marks included for service and tuning reference
  • No integrated pulleys for a clean harmonic balancer layout
  • 3-bolt crank interface with a 31.62 mm crank bore

Product Details

This Dayco harmonic balancer, part number PB1012ST, is engineered for small-block and big-block era performance and service applications where crankshaft vibration control matters. The 154.50 mm overall diameter, 59.50 mm overall width, and 44.85 mm nose outside diameter support a direct-fit style replacement across a wide range of Chevrolet and GMC platforms, including Camaro, Chevelle, El Camino, C10 Pickup, and Corvette applications. This part cross-references Dorman 594-156S for the same application.

The Street Performance Balancer line focuses on practical engine service parts with performance-oriented construction. PB1012ST is suited for engines that require a neutral-balance harmonic balancer with visible timing reference marks and a cast iron ring assembly.

What It Is Used For

  • Reducing crankshaft vibration in compatible V8 engine applications
  • Restoring timing reference visibility during ignition setup
  • Replacing a worn or damaged harmonic balancer
  • Supporting engine smoothness in street performance builds
  • Addressing pulley or ring wear on older engine assemblies

Installation Notes and Tips

Verify crank bore, bolt pattern, and balancer dimensions before installation. This unit does not include hardware, installation instructions, or a woodruff key. Confirm that the engine requires a neutral-balance balancer and that timing marks align with your setup. Fitment includes 1962-1976 Chevrolet and GMC applications, plus selected 1969-1972 Pontiac Ventura and 1969 Pontiac Beaumont listings.

Quality Assurance

Dayco supplies engine components for service and performance use, and PB1012ST is built with a cast iron outer ring and timing marks for consistent setup and operation.

This part fits 261 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersNotes
1976ChevroletMonza4.3LV8Street Performance Balancer
1975ChevroletMonza4.3LV8Street Performance Balancer
1975ChevroletNova4.3LV8Street Performance Balancer
1973ChevroletBlazer5.0LV8Street Performance Balancer
1973ChevroletC10 Pickup5.0LV8Street Performance Balancer
1973ChevroletC10 Suburban5.0LV8Street Performance Balancer
1973ChevroletC20 Pickup5.0LV8Street Performance Balancer
1973ChevroletC20 Suburban5.0LV8Street Performance Balancer
1973ChevroletC30 Pickup5.0LV8Street Performance Balancer
1973ChevroletCamaro5.0LV8Street Performance Balancer
1973ChevroletChevelle5.0LV8Street Performance Balancer
1973ChevroletEl Camino5.0LV8Street Performance Balancer
1973ChevroletG10 Van5.0LV8Street Performance Balancer
1973ChevroletG20 Van5.0LV8Street Performance Balancer
1973ChevroletK10 Pickup5.0LV8Street Performance Balancer
1973ChevroletK10 Suburban5.0LV8Street Performance Balancer
1973ChevroletK20 Pickup5.0LV8Street Performance Balancer
1973ChevroletK20 Suburban5.0LV8Street Performance Balancer
1973ChevroletK30 Pickup5.0LV8Street Performance Balancer
1973ChevroletNova5.0LV8Street Performance Balancer
1973GMCC15/C1500 Pickup5.0LV8Street Performance Balancer
1973GMCC15/C1500 Suburban5.0LV8Street Performance Balancer
1973GMCC25/C2500 Pickup5.0LV8Street Performance Balancer
1973GMCC25/C2500 Suburban5.0LV8Street Performance Balancer
1973GMCC35/C3500 Pickup5.0LV8Street Performance Balancer
1973GMCG15/G1500 Van5.0LV8Street Performance Balancer
1973GMCG35/G3500 Van5.0LV8Street Performance Balancer
1973GMCJimmy5.0LV8Street Performance Balancer
1973GMCK15/K1500 Pickup5.0LV8Street Performance Balancer
1973GMCK15/K1500 Suburban5.0LV8Street Performance Balancer
1973GMCK25/K2500 Pickup5.0LV8Street Performance Balancer
1973GMCK25/K2500 Suburban5.0LV8Street Performance Balancer
1973GMCK35/K3500 Pickup5.0LV8Street Performance Balancer
1973GMCSprint5.0LV8Street Performance Balancer
1972ChevroletBlazer5.0LV8Street Performance Balancer
1972ChevroletC10 Pickup5.0LV8Street Performance Balancer
1972ChevroletC10 Suburban5.0LV8Street Performance Balancer
1972ChevroletC20 Pickup5.0LV8Street Performance Balancer
1972ChevroletC20 Suburban5.0LV8Street Performance Balancer
1972ChevroletC30 Pickup5.0LV8Street Performance Balancer
1972ChevroletCamaro5.0LV8Street Performance Balancer
1972ChevroletChevelle5.0LV8Street Performance Balancer
1972ChevroletEl Camino5.0LV8Street Performance Balancer
1972ChevroletG10 Van5.0LV8Street Performance Balancer
1972ChevroletG20 Van5.0LV8Street Performance Balancer
1972ChevroletK10 Pickup5.0LV8Street Performance Balancer
1972ChevroletK10 Suburban5.0LV8Street Performance Balancer
1972ChevroletK20 Pickup5.0LV8Street Performance Balancer
1972ChevroletK20 Suburban5.0LV8Street Performance Balancer
1972ChevroletK30 Pickup5.0LV8Street Performance Balancer
1972ChevroletNova5.0LV8Street Performance Balancer
1972GMCC15/C1500 Pickup5.0LV8Street Performance Balancer
1972GMCC15/C1500 Suburban5.0LV8Street Performance Balancer
1972GMCC25/C2500 Pickup5.0LV8Street Performance Balancer
1972GMCC25/C2500 Suburban5.0LV8Street Performance Balancer
1972GMCC35/C3500 Pickup5.0LV8Street Performance Balancer
1972GMCG15/G1500 Van5.0LV8Street Performance Balancer
1972GMCG25/G2500 Van5.0LV8Street Performance Balancer
1972GMCG35/G3500 Van5.0LV8Street Performance Balancer
1972GMCJimmy5.0LV8Street Performance Balancer
1972GMCK15/K1500 Pickup5.0LV8Street Performance Balancer
1972GMCK15/K1500 Suburban5.0LV8Street Performance Balancer
1972GMCK25/K2500 Pickup5.0LV8Street Performance Balancer
1972GMCK25/K2500 Suburban5.0LV8Street Performance Balancer
1972GMCK35/K3500 Pickup5.0LV8Street Performance Balancer
1972GMCSprint5.0LV8Street Performance Balancer
1972PontiacVentura5.0LV8Street Performance Balancer
1971ChevroletBlazer5.0LV8Street Performance Balancer
1971ChevroletC10 Pickup5.0LV8Street Performance Balancer
1971ChevroletC10 Suburban5.0LV8Street Performance Balancer
1971ChevroletC20 Pickup5.0LV8Street Performance Balancer
1971ChevroletC20 Suburban5.0LV8Street Performance Balancer
1971ChevroletC30 Pickup5.0LV8Street Performance Balancer
1971ChevroletCamaro5.0LV8Street Performance Balancer
1971ChevroletChevelle5.0LV8Street Performance Balancer
1971ChevroletEl Camino5.0LV8Street Performance Balancer
1971ChevroletG10 Van5.0LV8Street Performance Balancer
1971ChevroletG20 Van5.0LV8Street Performance Balancer
1971ChevroletK10 Pickup5.0LV8Street Performance Balancer
1971ChevroletK10 Suburban5.0LV8Street Performance Balancer
1971ChevroletK20 Pickup5.0LV8Street Performance Balancer
1971ChevroletK20 Suburban5.0LV8Street Performance Balancer
1971ChevroletK30 Pickup5.0LV8Street Performance Balancer
1971ChevroletNova5.0LV8Street Performance Balancer
1971GMCC15/C1500 Pickup5.0LV8Street Performance Balancer
1971GMCC15/C1500 Suburban5.0LV8Street Performance Balancer
1971GMCC25/C2500 Pickup5.0LV8Street Performance Balancer
1971GMCC25/C2500 Suburban5.0LV8Street Performance Balancer
1971GMCC35/C3500 Pickup5.0LV8Street Performance Balancer
1971GMCG15/G1500 Van5.0LV8Street Performance Balancer
1971GMCG25/G2500 Van5.0LV8Street Performance Balancer
1971GMCJimmy5.0LV8Street Performance Balancer
1971GMCK15/K1500 Pickup5.0LV8Street Performance Balancer
1971GMCK15/K1500 Suburban5.0LV8Street Performance Balancer
1971GMCK25/K2500 Pickup5.0LV8Street Performance Balancer
1971GMCK25/K2500 Suburban5.0LV8Street Performance Balancer
1971GMCK35/K3500 Pickup5.0LV8Street Performance Balancer
1971GMCSprint5.0LV8Street Performance Balancer
1971PontiacVentura5.0LV8Street Performance Balancer
1970ChevroletBel Air7.4LV86-inch outside diameter; Street Performance Balancer
1970ChevroletBlazer5.0LV8Street Performance Balancer
1970ChevroletC10 Pickup5.0LV8Street Performance Balancer
1970ChevroletC10 Suburban5.0LV8Street Performance Balancer
1970ChevroletC20 Pickup5.0LV8Street Performance Balancer
1970ChevroletC20 Suburban5.0LV8Street Performance Balancer
1970ChevroletC30 Pickup5.0LV8Street Performance Balancer
1970ChevroletCamaro5.0LV8Street Performance Balancer
1970ChevroletChevelle5.0LV8Street Performance Balancer
1970ChevroletEl Camino5.0LV8Street Performance Balancer
1970ChevroletG10 Van5.0LV8Street Performance Balancer
1970ChevroletG20 Van5.0LV8Street Performance Balancer
1970ChevroletK10 Pickup5.0LV8Street Performance Balancer
1970ChevroletK10 Suburban5.0LV8Street Performance Balancer
1970ChevroletK20 Pickup5.0LV8Street Performance Balancer
1970ChevroletK20 Suburban5.0LV8Street Performance Balancer
1970ChevroletK30 Pickup5.0LV8Street Performance Balancer
1970ChevroletNova5.0LV8Street Performance Balancer
1970ChevroletTownsman7.4LV86-inch outside diameter; Street Performance Balancer
1970GMCC15/C1500 Pickup5.0LV8Street Performance Balancer
1970GMCC15/C1500 Suburban5.0LV8Street Performance Balancer
1970GMCC25/C2500 Pickup5.0LV8Street Performance Balancer
1970GMCC25/C2500 Suburban5.0LV8Street Performance Balancer
1970GMCC35/C3500 Pickup5.0LV8Street Performance Balancer
1970GMCG15/G1500 Van5.0LV8Street Performance Balancer
1970GMCG25/G2500 Van5.0LV8Street Performance Balancer
1970GMCJimmy5.0LV8Street Performance Balancer
1970GMCK15/K1500 Pickup5.0LV8Street Performance Balancer
1970GMCK15/K1500 Suburban5.0LV8Street Performance Balancer
1970GMCK25/K2500 Pickup5.0LV8Street Performance Balancer
1970GMCK25/K2500 Suburban5.0LV8Street Performance Balancer
1970GMCK35/K3500 Pickup5.0LV8Street Performance Balancer
1969ChevroletBel Air5.4LV86-inch outside diameter; Street Performance Balancer
1969ChevroletBiscayne5.4LV86-inch outside diameter; Street Performance Balancer
1969ChevroletBlazer5.0LV8Street Performance Balancer
1969ChevroletC10 Pickup5.0LV8Street Performance Balancer
1969ChevroletC10 Suburban5.0LV8Street Performance Balancer
1969ChevroletC20 Pickup5.0LV8Street Performance Balancer
1969ChevroletC20 Suburban5.0LV8Street Performance Balancer
1969ChevroletC30 Pickup5.0LV8Street Performance Balancer
1969ChevroletCamaro5.4LV86-inch outside diameter; Street Performance Balancer
1969ChevroletCamaro5.0LV8Street Performance Balancer
1969ChevroletCaprice5.4LV86-inch outside diameter; Street Performance Balancer
1969ChevroletChevelle5.0LV8Street Performance Balancer
1969ChevroletEl Camino5.0LV8Street Performance Balancer
1969ChevroletG10 Van5.0LV8Street Performance Balancer
1969ChevroletG20 Van5.0LV8Street Performance Balancer
1969ChevroletImpala5.4LV86-inch outside diameter; Street Performance Balancer
1969ChevroletK10 Pickup5.0LV8Street Performance Balancer
1969ChevroletK20 Pickup5.0LV86-inch outside diameter; Street Performance Balancer
1969ChevroletK20 Pickup5.0LV8Street Performance Balancer
1969ChevroletK20 Suburban5.0LV8Street Performance Balancer
1969ChevroletK30 Pickup5.0LV86-inch outside diameter; Street Performance Balancer
1969ChevroletK30 Pickup5.0LV8Street Performance Balancer
1969ChevroletNova5.0LV8Street Performance Balancer
1969ChevroletP20 Van5.0LV8Street Performance Balancer
1969ChevroletP30 Van5.0LV8Street Performance Balancer
1969GMCC15/C1500 Pickup5.0LV8Street Performance Balancer
1969GMCC15/C1500 Suburban5.0LV8Street Performance Balancer
1969GMCC25/C2500 Suburban5.0LV8Street Performance Balancer
1969GMCG15/G1500 Van5.0LV8Street Performance Balancer
1969GMCK25/K2500 Suburban5.0LV8Street Performance Balancer
1969GMCP25/P2500 Van5.0LV8Street Performance Balancer
1969GMCP35/P3500 Van5.0LV8Street Performance Balancer
1969PontiacBeaumont5.0LV8Street Performance Balancer
1968ChevroletBel Air5.4LV86-inch outside diameter; Street Performance Balancer
1968ChevroletBiscayne5.4LV86-inch outside diameter; Street Performance Balancer
1968ChevroletC10 Pickup5.4LV86-inch outside diameter; Street Performance Balancer
1968ChevroletC10 Pickup5.3LV86-inch outside diameter; Street Performance Balancer
1968ChevroletC10 Suburban5.4LV86-inch outside diameter; Street Performance Balancer
1968ChevroletC20 Pickup5.4LV86-inch outside diameter; Street Performance Balancer
1968ChevroletC20 Pickup5.3LV86-inch outside diameter; Street Performance Balancer
1968ChevroletC30 Pickup5.4LV86-inch outside diameter; Street Performance Balancer
1968ChevroletC30 Pickup5.3LV86-inch outside diameter; Street Performance Balancer
1968ChevroletCamaro5.4LV86-inch outside diameter; Street Performance Balancer
1968ChevroletCaprice5.4LV86-inch outside diameter; Street Performance Balancer
1968ChevroletChevelle5.4LV86-inch outside diameter; Street Performance Balancer
1968ChevroletChevy II5.4LV86-inch outside diameter; Street Performance Balancer
1968ChevroletCorvette5.4LV86-inch outside diameter; Street Performance Balancer
1968ChevroletEl Camino5.4LV86-inch outside diameter; Street Performance Balancer
1968ChevroletImpala5.4LV86-inch outside diameter; Street Performance Balancer
1968ChevroletK10 Pickup5.4LV86-inch outside diameter; Street Performance Balancer
1968ChevroletK10 Pickup5.3LV86-inch outside diameter; Street Performance Balancer
1968ChevroletK10 Suburban5.4LV8Street Performance Balancer
1968ChevroletK20 Pickup5.4LV86-inch outside diameter; Street Performance Balancer
1968ChevroletK20 Pickup5.3LV86-inch outside diameter; Street Performance Balancer
1968ChevroletK20 Suburban5.4LV8Street Performance Balancer
1968ChevroletK30 Pickup5.4LV86-inch outside diameter; Street Performance Balancer
1968ChevroletK30 Pickup5.3LV86-inch outside diameter; Street Performance Balancer
1968GMCC15/C1500 Pickup5.4LV86-inch outside diameter; Street Performance Balancer
1968GMCC15/C1500 Pickup5.3LV86-inch outside diameter; Street Performance Balancer
1968GMCC15/C1500 Suburban5.4LV8Street Performance Balancer
1968GMCC25/C2500 Pickup5.4LV86-inch outside diameter; Street Performance Balancer
1968GMCC25/C2500 Pickup5.3LV8Street Performance Balancer
1968GMCC25/C2500 Suburban5.4LV86-inch outside diameter; Street Performance Balancer
1968GMCC35/C3500 Pickup5.4LV86-inch outside diameter; Street Performance Balancer
1968GMCC35/C3500 Pickup5.3LV86-inch outside diameter; Street Performance Balancer
1968GMCG15/G1500 Van5.0LV8Street Performance Balancer
1968GMCK15/K1500 Pickup5.4LV86-inch outside diameter; Street Performance Balancer
1968GMCK15/K1500 Pickup5.3LV86-inch outside diameter; Street Performance Balancer
1968GMCK15/K1500 Suburban5.4LV86-inch outside diameter; Street Performance Balancer
1968GMCK25/K2500 Pickup5.4LV86-inch outside diameter; Street Performance Balancer
1968GMCK25/K2500 Suburban5.4LV8Street Performance Balancer
1968GMCK35/K3500 Pickup5.4LV86-inch outside diameter; Street Performance Balancer
1968GMCK35/K3500 Pickup5.3LV8Street Performance Balancer
1967ChevroletBel Air5.3LV86-inch outside diameter; Street Performance Balancer
1967ChevroletBiscayne5.3LV86-inch outside diameter; Street Performance Balancer
1967ChevroletC10 Pickup5.3LV86-inch outside diameter; Street Performance Balancer
1967ChevroletC20 Pickup5.3LV86-inch outside diameter; Street Performance Balancer
1967ChevroletC30 Pickup5.3LV86-inch outside diameter; Street Performance Balancer
1967ChevroletCamaro5.3LV86-inch outside diameter; Street Performance Balancer
1967ChevroletCaprice5.3LV86-inch outside diameter; Street Performance Balancer
1967ChevroletChevelle5.3LV86-inch outside diameter; Street Performance Balancer
1967ChevroletChevy II5.3LV86-inch outside diameter; Street Performance Balancer
1967ChevroletCorvette5.3LV86-inch outside diameter; Street Performance Balancer
1967ChevroletEl Camino5.3LV86-inch outside diameter; Street Performance Balancer
1967ChevroletImpala5.4LV86-inch outside diameter; Street Performance Balancer
1967ChevroletImpala5.3LV86-inch outside diameter; Street Performance Balancer
1967ChevroletK10 Pickup5.3LV86-inch outside diameter; Street Performance Balancer
1967ChevroletK20 Pickup5.3LV86-inch outside diameter; Street Performance Balancer
1967GMCC15/C1500 Pickup5.3LV8Street Performance Balancer
1967GMCC25/C2500 Pickup5.3LV8Street Performance Balancer
1967GMCC35/C3500 Pickup5.3LV8Street Performance Balancer
1967GMCK15/K1500 Pickup5.3LV8Street Performance Balancer
1967GMCK25/K2500 Pickup5.3LV8Street Performance Balancer
1966ChevroletBel Air5.3LV86-inch outside diameter; Street Performance Balancer
1966ChevroletBiscayne5.3LV86-inch outside diameter; Street Performance Balancer
1966ChevroletC10 Pickup5.3LV86-inch outside diameter; Street Performance Balancer
1966ChevroletC20 Pickup5.3LV86-inch outside diameter; Street Performance Balancer
1966ChevroletC30 Pickup5.3LV86-inch outside diameter; Street Performance Balancer
1966ChevroletCaprice5.3LV86-inch outside diameter; Street Performance Balancer
1966ChevroletChevelle5.3LV86 In. Diameter; Street Performance Balancer
1966ChevroletChevy II5.3LV86-inch outside diameter; Street Performance Balancer
1966ChevroletCorvette5.3LV86-inch outside diameter; Street Performance Balancer
1966ChevroletEl Camino5.3LV86-inch outside diameter; Street Performance Balancer
1966ChevroletImpala5.4LV86-inch outside diameter; Street Performance Balancer
1966ChevroletImpala5.3LV86-inch outside diameter; Street Performance Balancer
1966ChevroletK10 Pickup5.3LV86-inch outside diameter; Street Performance Balancer
1966ChevroletK20 Pickup5.3LV86-inch outside diameter; Street Performance Balancer
1965ChevroletBel Air5.3LV86-inch outside diameter; Street Performance Balancer
1965ChevroletBiscayne5.3LV86-inch outside diameter; Street Performance Balancer
1965ChevroletChevelle5.3LV86-inch outside diameter; Street Performance Balancer
1965ChevroletChevy II5.3LV86-inch outside diameter; Street Performance Balancer
1965ChevroletCorvette5.3LV86-inch outside diameter; Street Performance Balancer
1965ChevroletEl Camino5.3LV86-inch outside diameter; Street Performance Balancer
1965ChevroletImpala5.4LV86-inch outside diameter; Street Performance Balancer
1965ChevroletImpala5.3LV86-inch outside diameter; Street Performance Balancer
1964ChevroletBel Air5.3LV86-inch outside diameter; Street Performance Balancer
1964ChevroletBiscayne5.3LV86-inch outside diameter; Street Performance Balancer
1964ChevroletChevelle5.3LV8Street Performance Balancer
1964ChevroletCorvetteStreet Performance Balancer
1964ChevroletEl Camino5.3LV8Street Performance Balancer
1964ChevroletImpala5.4LV86-inch outside diameter; Street Performance Balancer
1964ChevroletImpala5.3LV86-inch outside diameter; Street Performance Balancer
1963ChevroletBel Air5.3LV86-inch outside diameter; Street Performance Balancer
1963ChevroletBiscayne5.3LV86-inch outside diameter; Street Performance Balancer
1963ChevroletCorvette6-inch outside diameter; Street Performance Balancer
1963ChevroletImpala5.3LV86-inch outside diameter; Street Performance Balancer
1962ChevroletBel Air5.3LV83 bolt w/counterweight & counter sunk pulley; Street Performance Balancer
1962ChevroletBiscayne5.3LV86-inch outside diameter; Street Performance Balancer
1962ChevroletCorvette6-inch outside diameter; Street Performance Balancer
1962ChevroletImpala5.3LV86-inch outside diameter; Street Performance Balancer
Directly replaces or cross-references 3 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Dorman — 594-156SPioneer — 872001Pioneer — DA-3270HD