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Founder, 1929-2014
Speedy Bill
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Harmonic Balancers

Harmonic Balancers

Your harmonic balancer connects to your crankshaft and it's job is to reduce torsional vibration and serve as a pully for drive belts. Without this damper, crankshaft failure is imminent. Take care of your crank with a quality harmonic balancer from Speedway Motors. We carry the top brands like Enginequest, Fluidampr and Professional Products to make sure you get the best parts and with Speedway Motors, you know you'll be getting the best price too.

Featured Products
  • Professional Products 80010 Chevy 350 Lightweight Balancer, 6 Inch
    Professional Products 80010 Chevy 350 Lightweight Balancer, 6 Inch
    (Part #91015363)
    x
                

    This 6" harmonic balancer fits 350 c.i. Small Block Chevys and only weighs 5.1 lbs. Plus, the balancing cut out is on the backside so they can't tell what crank you're running. Damper is a press-on fit.

    • For internally balanced engines
    • Durable nodular iron construction
    • High temperature elastomer bond
    • Engraved timing marks every 90° 
    • Includes 60° of easy-to-read timing marks 
    • Rated to 10,000 RPM
    • NOT SFI approved

    910-15363 Instructions (PDF) 

    Technical Notes (PDF) 

  • Small Block Chevy Harmonic Balancer, 6-3/4 Inch, Black
    Small Block Chevy Harmonic Balancer, 6-3/4 Inch, Black
    (Part #91015358)
    x
                

    Small block Chevy stock-type replacement 6-3/4" diameter harmonic balancer. For internal balance engines.

    • NOT recommended for RPM's in excess of 6500
    • NOT SFI certified
    • Internal balance
  • Speedway Small Block Chevy 350 Fluid Crank Damper, 6.25 Inch
    Speedway Small Block Chevy 350 Fluid Crank Damper, 6.25 Inch
    (Part #91015342)
    x
                

    Balancer for Small Block Chevy 350 c.i. V-8. Degreed from 10o ATDC to 50o BTDC.  SFI 18.1 certified.

  • Chevy 383-400 Lightweight Balancer, 6-3/4 Inch
    Chevy 383-400 Lightweight Balancer, 6-3/4 Inch
    (Part #91015364)
    x
                

    This 6-3/4" balancer fits 383/400 c.i. Small Block Chevys and only weighs 7-3/4 lbs. Plus, the balancing cut out is on the backside so they can't tell what crank you're running. Damper is a press-on fit.

    • Durable nodular iron construction
    • High temperature elastomer bond
    • This balancer is 1.20" thick
    • Rated to 6,500 RPM
    • NOT SFI approved 
  • Professional Products Small Block Ford Harmonic Balancers
    Professional Products Small Block Ford Harmonic Balancers
    (Part #91015365)
    x
                

    These PowerForce series balancers from Professional Products are available in 28 oz. or 50 oz. balance. They both measure 6.4" in diameter, are 3" in total length, and are marked to 40 degrees at three locations. Plus, they feature both 3 and 4 bolt pulley holes, which allows the use of late model serpentine drive systems on early engines if desired. Counter weight is removable for zero balanced cranks. Fits most 260/289/302/351W/5.0L Ford engines.  6500 RPM max limit.

    See Notes tab for spacer requirements.

    28 oz. Balancer (S/B Ford V8 1963-80)

    • Matches O.D. and thickness of the stock early (1963-69) dampers
    • Counterbalance weight matches the stock 28 ounce inches
    • Overall balance specifications are held tighter than the original O.E. tolerances
    • Dual Bolt Pattern - both the "early" 3-bolt and the "late" 4-bolt patterns
    • Removeable Counterweight - if building a neutral balance engine simply remove the bolt-in counterweight on the back of the damper

    50 oz. Balancer (S/B Ford V8 1981-95)

    • Made to the early short length of 3" - allows the use of a late 5.0L engine with a 50 oz. in. damper to be used in an early chassis where front clearance is at a minimum
    • To fit in late vehicles, use spacers to provide the correct front pulley alignment
    • Dual Bolt Pattern - both the "early" 3-bolt and the "late" 4-bolt patterns
    • Plastic insert shown in photos can be used to center 3-bolt pulleys with a female pilot, or it can be removed to accept 3-bolt pulleys with a male pilot
    • Very versatile and can be used on many different Ford engines

    Harmonic Balancer Technical Notes (PDF)

    910-15365 Instructions (PDF)

  • Chevy 350 Harmonic Balancer, 8 Inch, Plain Steel
    Chevy 350 Harmonic Balancer, 8 Inch, Plain Steel
    (Part #91015357)
    x
                

    Small block Chevy 350 c.i. V-8 stock-type replacement 8" harmonic balancers. Internal balanced. Dampers are designed for press fit.

    • Ring and hub are bonded (vulcanized) to the elastomer
    • Surpasses the reliability and strength of OEM
    • NOT SFI-Approved
  • Speedway Chrome SB Chevy 350 Fluid Crank Damper, 6.25 Inch
    Speedway Chrome SB Chevy 350 Fluid Crank Damper, 6.25 Inch
    (Part #91015330)
    x
                

    Chrome plated steel balancer for S/B Chevy 350 c.i. V-8. Degreed from 10° ATDC to 50° BTDC. SFI serial number and timing marks are etched on the outer ring.

    • Forged from 1025 low carbon steel  
    • Injected with high viscosity silicone fluid
    • Rated to 12,500 RPM
    • SFI 18.1 certified
  • Professional Products 81007 S/B Ford Balancer Pulley Spacer, 1 Inch
    Professional Products 81007 S/B Ford Balancer Pulley Spacer, 1 Inch
    (Part #91015367)
    x
                

    This spacer must be used when replacing an original balancer that is 4" long which were typically found on '80 and later 351W, '80 and earlier 302, and late model 5.0L engines with some triming of spacer required on 5.0L engines.

    Harmonic Balancer Technical Notes (PDF)

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  • Speedway Small Block Chevy 350 Fluid Crank Damper, 6.25 Inch
    Speedway Small Block Chevy 350 Fluid Crank Damper, 6.25 Inch
    (Part #91015342)
    x
                

    Balancer for Small Block Chevy 350 c.i. V-8. Degreed from 10o ATDC to 50o BTDC.  SFI 18.1 certified.

  • 1970-90 Chevy 454 Harmonic Balancer, 8 Inch, Black
    1970-90 Chevy 454 Harmonic Balancer, 8 Inch, Black
    (Part #57523401)
    x
                

    Big block Chevy 454 c.i. V-8 (1970-1990) stock-type replacement harmonic balancer.

    • 8.00" O.D. 
    • External Balance
    • NOT SFI approved
  • Professional Products Small Block Ford Harmonic Balancers
    Professional Products Small Block Ford Harmonic Balancers
    (Part #91015365)
    x
                Please view the product's page for more information
            
  • 429/460 Ford Harmonic Balancer, SFI Approved
    429/460 Ford Harmonic Balancer, SFI Approved
    (Part #57524461)
    x
                

    When you rebuild an engine you should replace that 20 year old OEM balancer with a new one. This balancer is neutral or zero balanced and will not work with our rotating kit 915-545.

    Black, SFI approved.

  • Fluidampr Balancers 550203 8BA Ford Flathead Damper, Wide Belt
    Fluidampr Balancers 550203 8BA Ford Flathead Damper, Wide Belt
    (Part #755550203)
    x
                

    The high-tech Fluidampr uses silicone fluid to control the torsional harmonic vibrations created by your Flathead Ford V8. This is far superior to original-style dampers and will help eliminate crankshaft breaks, reduce wear on main bearings and increase horsepower.

    This damper is for 1949 Ford 8BA Flatheads with single 5/8" "wide" accessory belts. It has two pulley grooves.

    • Proven viscous fluid dampening
    • Reduces crankshaft breaks and bearing wear
    • Great looking chrome finish
    • Made in the USA
  • Chevy 383-400 Lightweight Balancer, 6-3/4 Inch
    Chevy 383-400 Lightweight Balancer, 6-3/4 Inch
    (Part #91015364)
    x
                

    This 6-3/4" balancer fits 383/400 c.i. Small Block Chevys and only weighs 7-3/4 lbs. Plus, the balancing cut out is on the backside so they can't tell what crank you're running. Damper is a press-on fit.

    • Durable nodular iron construction
    • High temperature elastomer bond
    • This balancer is 1.20" thick
    • Rated to 6,500 RPM
    • NOT SFI approved 
  • 1981-95 Ford 302 Chrome Balancer, 50 Oz., 6.40 Inch O.D.
    1981-95 Ford 302 Chrome Balancer, 50 Oz., 6.40 Inch O.D.
    (Part #57530212)
    x
                

    Chrome harmonic balancer for 1981-1995 Late Model Ford 5.0L/302/H.O. small block engines.

    • 50 oz. counter balance
    • 6.405" O.D.
    • Chrome finish
  • Professional Products 1949-53 Ford Flathead Crank Pulley-5/8 Inch Belt
    Professional Products 1949-53 Ford Flathead Crank Pulley-5/8 Inch Belt
    (Part #91015598)
    x
                

    If you have ever built a flathead Ford you know the crank pulley is easy to bend and has no vibration dampening features. For use with 5/8" belt on balancer 910-15596.

  • Small Block Chevy 400 Harmonic Balancer, 8 Inch, Plain Steel
    Small Block Chevy 400 Harmonic Balancer, 8 Inch, Plain Steel
    (Part #91015400)
    x
                

    Small block Chevy 400 c.i. V-8 stock-type replacement 8" harmonic balancers. External Balanced. Dampers are designed for press fit.

    • Ring and hub are bonded (vulcanized) to the elastomer
    • Surpasses the reliability and strength of OEM
    • NOT SFI-Approved
  • Professional Products 80010 Chevy 350 Lightweight Balancer, 6 Inch
    Professional Products 80010 Chevy 350 Lightweight Balancer, 6 Inch
    (Part #91015363)
    x
                

    This 6" harmonic balancer fits 350 c.i. Small Block Chevys and only weighs 5.1 lbs. Plus, the balancing cut out is on the backside so they can't tell what crank you're running. Damper is a press-on fit.

    • For internally balanced engines
    • Durable nodular iron construction
    • High temperature elastomer bond
    • Engraved timing marks every 90° 
    • Includes 60° of easy-to-read timing marks 
    • Rated to 10,000 RPM
    • NOT SFI approved

    910-15363 Instructions (PDF) 

    Technical Notes (PDF) 

  • 1984-1993 Small Block Chevy 305-350 High Performance Damper
    1984-1993 Small Block Chevy 305-350 High Performance Damper
    (Part #91015371)
    x
                

    High Performance Sportsman Dampers raise the bar in the high performance industry. The combination of top quality and reasonable pricing sets new standards.  This later model balancer has the timing mark moved compared to earlier engines.

    This Small Block Chevy damper is cast from nodular iron and suitable for engines generating up to 400 horsepower. Unlike most OEM dampers, the hub and ring are splined to prevent radial movement of the outer ring. Although this is not SFI Certified, this damper is 30% stronger than OEM dampers made from grey iron.

    • 6.75" OD
    • Black finish
    • Internal balance
    • Ideal for street rebuilds
    • Manufactured from nodular iron
    • CAD engineered and CNC machined
    • Perfect replacement for OEM applications
    • Suitable for high performance up to 6,000 RPM

     

  • Fluidampr Balancers 600203 8BA Ford Flathead Damper, Narrow Belt
    Fluidampr Balancers 600203 8BA Ford Flathead Damper, Narrow Belt
    (Part #755690201)
    x
                

    The high-tech Fluidampr uses silicone fluid to control the torsional harmonic vibrations created by your Flathead Ford V8. This is far superior to original-style dampers and will help eliminate crankshaft breaks, reduce wear on main bearings and increase horsepower.

    This damper is for 1950 & later Ford 8BA Flatheads with the "narrow" 3/8" accessory belts. It has two pulley grooves.

    • Proven viscous fluid dampening
    • Reduces crankshaft breaks and bearing wear
    • Great looking chrome finish
    • Made in the USA
  • Small Block Chevy Harmonic Balancer, 6-3/4 Inch, Black
    Small Block Chevy Harmonic Balancer, 6-3/4 Inch, Black
    (Part #91015358)
    x
                

    Small block Chevy stock-type replacement 6-3/4" diameter harmonic balancer. For internal balance engines.

    • NOT recommended for RPM's in excess of 6500
    • NOT SFI certified
    • Internal balance
  • Professional Products 81006 S/B Ford Balancer Pulley Spacer, 3/8 Inch
    Professional Products 81006 S/B Ford Balancer Pulley Spacer, 3/8 Inch
    (Part #91015366)
    x
                

    This spacer must be used when replacing an original balancer that is 3-3/8" long which were typically found on '79 and earlier 351W engines.

    Harmonic Balancer Technical Notes (PDF)

  • Chevy 350 Harmonic Balancer, 8 Inch, Plain Steel
    Chevy 350 Harmonic Balancer, 8 Inch, Plain Steel
    (Part #91015357)
    x
                

    Small block Chevy 350 c.i. V-8 stock-type replacement 8" harmonic balancers. Internal balanced. Dampers are designed for press fit.

    • Ring and hub are bonded (vulcanized) to the elastomer
    • Surpasses the reliability and strength of OEM
    • NOT SFI-Approved
  • Speedway Chrome SB Chevy 400 Fluid Crank Damper, 7-1/4 Inch
    Speedway Chrome SB Chevy 400 Fluid Crank Damper, 7-1/4 Inch
    (Part #91015329)
    x
                

    Chrome plated steel balancer for S/B Chevy 383/400 c.i. V-8. Degreed from 10° ATDC to 50° BTDC. SFI serial number and timing marks are engraved on the outer ring.

    • Forged from 1025 low carbon steel  
    • Injected with high viscosity silicone fluid
    • External Balance 
    • Rated to 12,500 RPM
    • SFI 18.1 certified
    • 1.53" thickness excluding hub
  • Garage Sale - Small Block Chevy 400 Harmonic Balancer, 8 Inch, Plain Steel
    Garage Sale
    Garage Sale - Small Block Chevy 400 Harmonic Balancer, 8 Inch, Plain Steel
    (Part #UP51370)
    x
                

    This balancer is garage sale priced because it has been test fit and returned. 

      No Warranty, No Returns On Garage Sale Items

    Small block Chevy 400 c.i. V-8 stock-type replacement 8" harmonic balancers. External Balanced. Dampers are designed for press fit.

    • Ring and hub are bonded (vulcanized) to the elastomer
    • Surpasses the reliability and strength of OEM
    • NOT SFI-Approved
  • Chevy 350 Harmonic Balancer, 8 Inch, Stainless Steel
    Chevy 350 Harmonic Balancer, 8 Inch, Stainless Steel
    (Part #91015348)
    x
                

    Small block Chevy 350 c.i. V-8 stock-type replacement 8" harmonic balancers. Internal balanced. Dampers are designed for press fit.

    • Ring and hub are bonded (vulcanized) to the elastomer
    • Surpasses the reliability and strength of OEM
    • Stainless steel version features a show quality polish
    • NOT SFI-Approved
  • Fluidampr Balancers 620101 Small Block Chevy Crank Damper, 6.25 Inch
    Fluidampr Balancers 620101 Small Block Chevy Crank Damper, 6.25 Inch
    (Part #755712615)
    x
                

    Eliminates crankshaft breaks, reduces wear on main bearings and increases horsepower. Fits 262-350 Small Block Chevy 1955-up (will not fit '92-up LT1). Internal balanced. 

    • 6-1/4" diameter
    • 7.9 lbs.
    • Steel housing
    • Black zinc chromate finsih
  • 1981-95 S/B Ford 302 4-Bolt Balancer, 50 Oz.
    1981-95 S/B Ford 302 4-Bolt Balancer, 50 Oz.
    (Part #91015334)
    x
                

    This Small Block Ford balancer features billet steel forgings, a durable elastomer bond. The 50 oz. balance factor is common to 1981-95 302.

    Has a 4-bolt pulley hub.  Has a anodized black finish.

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