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Professional Products Small Block Ford Harmonic Balancers

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What's in the Box

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)

Application

91015366 - 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.

91015367 - 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.

91015368 - This spacer must be used when replacing an original balancer that is 3-7/8" long which were typically found on '80 and earlier 351W Ford racing HO engines or '80 and later 351W, 302, or 5.0L engines using the Ford Racing .917" crank sprocket.

Notes

This engine family used 1 of 5 common length balancers, use the following information to determine your application needed. They are made to early style length of 3" to allow their use in tight applications, but adding on with a spacer for pulleys listed below, you can fit almost any car and pulley combo. These spacers are unique and can only be used with the new balancers shown here. Pulley spacers listed are a 4 bolt design, but can be redrilled for the 3 bolt arrangement. 

  • 3" long - no pulley spacer required, white spacer adaptor ring can be removed from balancer
  • 3-3/16" long - limited applications, use 91015366 (#81006) spacer and machine .090" off of 3 surfaces
  • 3-3/8" long - use 91015366 (#81006) spacer
  • 3-7/8" long - use 91015368 (#81008) spacer
  • 4" long - use 91015367 (#81007) spacer

You may also be interested in:

Small Block Ford 302-351 4-Bolt Balancers
                        

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.

EngineQuest BA289N Small Block Ford 3-Bolt Balancer, 28 oz.
                        This all new "early" style 28 oz. balancer works with 3-bolt pulleys. The 28 oz. balance factor is common to 1965-69 289, 1970-80 302, and 1970-96 351W.
                    
Small Block Ford V8 Balancer Bolt
                        

Harmonic balancer bolt and washer fit the Small Block Ford V8 302-351W and has a 12 point head.

  • 170,000 PSI strength
  • Thick, 1/4" washer

 

Professional Products 81006 S/B Ford Balancer Pulley Spacer, 3/8 Inch
                        

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)

Professional Products 81007 S/B Ford Balancer Pulley Spacer, 1 Inch
                        

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)

Professional Products 81008 S/B Ford Balancer Pulley Spacer, 7/8 Inch
                        

This spacer must be used when replacing an original balancer that is 3-7/8" long which were typically found on '80 and earlier 351W Ford racing HO engines or '80 and later 351W, 302, or 5.0L engines using the Ford Racing .917" crank sprocket.

Harmonic Balancer Technical Notes (PDF)