GM LS SFI Certified High Performance Harmonic Balancer
GM LS SFI Certified High Performance Harmonic Balancer
Speedway Motors

|

#91021811

GM LS SFI Certified High Performance Harmonic Balancer

  • Fits most LS engines and meets SFI Specification 18.1
  • Free up horsepower over stock dampers, 30% more efficient abouve 5,000 rpm
  • CNC-machined and designed to mount to crank hub so timing marks never change position
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$246.99

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Garage Sale alternatives: from $219.99


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Product Summary

6.325" Outside Diameter, 18.1 SFI Rating, Steel, Black

  • Fits most LS engines and meets SFI Specification 18.1
  • Free up horsepower over stock dampers, 30% more efficient abouve 5,000 rpm
  • CNC-machined and designed to mount to crank hub so timing marks never change position
  • Features inertial ring and hub, rebuild-able and tunable by replacing elastomer strips
  • Exposed inertial weight at TDC provide indicator that elastomer strips need replaced when marks start to move
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Key Specs

MFG. Part #91021811
Outside Diameter6.325"
Material TypeSteel
FinishPainted
SFI RatedYes
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Speedway Motors 91021811 Details

Speedway Motor's LS Harmonic Balancer is 30% more efficient above 5,000 rpm and frees up horse power over stock dampers. The shell is CNC-machined and is designed to mount to the crank hub so the timing marks never change position. It features an inertia ring and hub and is rebuild-able and tunable by replacing the elastomer strips. As an added feature, with the exposed inertia weight marked at TDC, you can tell that the elastomer strips need replacing when the marks start to move. All-around, this harmonic balancer has been built to handle your high performance LS engine with ease.

  • Fits most LS engines and meets SFI Specification 18.1
  • Free up horsepower over stock dampers, 30% more efficient above 5,000 rpm
  • CNC-machined and designed to mount to crank hub so timing marks never change position
  • Features inertial ring and hub, rebuild-able and tunable by replacing elastomer strips
  • Exposed inertial weight at TDC provide indicator that elastomer strips need replaced when marks start to move

Charts

Speedway Motors 91021811 Specifications

KEY SPECS
MFG. Part #91021811
BrandSpeedway Motors
Outside Diameter6.325"
Material TypeSteel
FinishPainted
SFI RatedYes
GENERAL
SFI Rating18.1
Sold in QuantityEach
Engine BalanceInternal
Degree MarkingsYes
ColorBlack
Harmonic Balancer ConstructionElastomer

Ratings & Reviews

4.8

5 Reviews

Overall Assessment

Customers highly appreciate the product for its quality construction and functionality, fitting well and performing as expected. Notable traits include great aesthetics and practical design. The majority would purchase it again, reflecting the product's success over competitors. Impressive usability and high material quality are its key selling points and reasons for customer recommendations.

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4.8

5 reviews

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Nice part!

5.0

14 days ago

Mikes

Covina, CA

Verified

Right out of the box. Perfect fit. No problems.

Would Recommend

I would buy product again

5.0

a year ago

BKG

Seminole county. Ga

Verified

Balancer fit great. Worked perfect for my 6.0 LS drag motor

Would Recommend

Yes, I would

4.0

a year ago

Back

Springfield Missouri

Verified

At work good when I got the right one

Would Recommend

Worked as it should.

5.0

3 years ago

Matt

Wi

Verified

Fit well and does what it's supposed to.

Would Recommend

I'll buy it again

5.0

4 years ago

LS man

Wartburg tn

Verified

Looks great and works great

Showing 5 of 5 reviews

Questions & Answers

2 Questions • 2 Answers

Does it have a pulley for the serpentine for truck spacing

by John

• 6 months ago

1 answer

View Answer

Does this have a keyway

by Ben

• 2 years ago

1 answer

View Answer

2 of 2 questions shown

Fitment

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  • GM LM7

  • GM LQ9

  • 6.2 Chevy LS V8

  • GM LM7

  • GM LQ9

  • 6.2 Chevy LS V8

  • GM LM7

  • GM LQ9

  • 6.2 Chevy LS V8

  • GM L76

  • GM LC9

  • GM LMG

  • GM LY5

  • GM LY5

  • GM LM7

  • 4.8 Chevy LS V8

  • GM LM7

  • GM LQ4

  • GM LS1

  • GM LS3

  • GM LS1

  • GM LS1

  • GM LS6

  • GM LS2

  • GM LS3

  • 4.8 Chevy LS V8

  • GM LM7

  • 4.8 Chevy LS V8

  • GM L20

  • GM LM7

  • GM LY2

  • 4.8 Chevy LS V8

  • GM LM7

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • GM LQ9

  • GM LQ4

  • GM LM7

  • GM LQ4

  • GM LQ9

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • GM LS3

  • GM LM4

  • GM LMG

  • GM LY5

  • GM LM7

  • GM L59

  • GM LM7

  • GM LC9

  • GM LMG

  • GM LY5

  • GM LC9

  • GM LMG

  • GM LMG

  • GM LY5

  • GM LQ4

  • GM LMG

  • GM LY5

  • 4.8 Chevy LS V8

  • GM L59

  • GM LM7

  • 4.8 Chevy LS V8

  • GM LMG

  • GM LY5

  • 6.2 Chevy LS V8

  • GM LC9

  • GM LMG

  • GM LC9

  • GM LMG

  • GM LMG

  • GM LY5

  • GM LH6

  • GM LS2

  • GM LM4

  • GM LM4

  • GM LM4

  • 4.8 Chevy LS V8

  • GM LM7

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM L33

  • GM LM7

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM L33

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM LM7

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM L33

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM LM7

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM L33

  • GM LQ4

  • GM L20

  • GM LC9

  • GM LMG

  • GM L33

  • GM L59

  • GM LM7

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • GM LM7

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM L20

  • GM LM7

  • GM LY2

  • GM LC9

  • GM LMG

  • GM LM7

  • GM L59

  • GM LM7

  • GM LQ4

  • GM LQ4

  • GM LQ4

  • 6.2 Chevy LS V8

  • GM LH8

  • GM LH8

  • GM LS1

  • GM LS3

  • GM LS1

  • GM LS2

Customer Impersonation Script