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Street Race Truck More... The Toolbox

Vital to engine durability, a harmonic balancer dampens harmful engine vibrations that increase wear rates of internal engine parts. Known by many names (harmonic damper, engine dampener, crankshaft balancer), the harmonic balancer is mounted to the snout of the crankshaft using either a press-fit or a retaining bolt. Before choosing a harmonic balancer, there are a few different types you should familiarize yourself with.

 

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Small Block Chevy Harmonic Balancer, 6-3/4 Inch, Black

Chevy Small Block V8, 6.75" Outside Diameter, Steel

Outside Diameter: 6.75"

Inside Diameter: 1.20"

Overall Thickness: 2.31"

Thickness: 1.1875"

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Professional Products 80010 SBC Lightweight Harmonic Balancer, 6"

265, 267, 283, 302, 305, 307, 327, 350, 262, Steel

Outside Diameter: 6.00"

Inside Diameter: 1.25"

Overall Length: 2.35"

SFI Rating: Not SFI-approved

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Speedway SBC 350 Fluid Crank Harmonic Balancer, 6.25 Inch

6.25" Outside Diameter, 18.1 SFI Rating

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Outside Diameter: 6.25"

SFI Rating: 18.1

Engine Balance: Internal

Degree Markings: Yes

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Pro Race 21262 Pro/Street 6.1 Inch SBC Harmonic Balancer,Internal

283, 302, 305, 307, 327, 350, 6.1" Outside Diameter

Outside Diameter: 6.1"

Inside Diameter: 1.246"

SFI Rating: Not SFI-approved

Weight: 4.6 lbs.

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Chevy 383-400 Lightweight Harmonic Balancer, 6-3/4Inch

383, 395, 400, 6.75" Outside Diameter, 7.75 lbs. Weight

Outside Diameter: 6.75"

Inside Diameter: 1.25"

Overall Thickness: 2.20"

SFI Rating: Not SFI-approved

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Professional Products Small Block Ford Harmonic Balancers

260, 289, 302, 351W, 5.0L, 6.40" Outside Diameter

Outside Diameter: 6.40"

Overall Length: 3.00"

Engine Balance: External

Degree Markings: Yes

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429/460 Ford Harmonic Balancer, SFI Approved

429, 460, 6.7" Outside Diameter, 1.37" Inside Diameter

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Outside Diameter: 6.7"

Inside Diameter: 1.37"

Thickness: 1.42"

SFI Rating: 18.1

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SBF 289-351W 28 Oz Harmonic Balancer

289, 302, 327, 347, 351C, 351M, 351W, 18.1 SFI Rating

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Outside Diameter: 6.4"

SFI Rating: 18.1

Engine Balance: External

Degree Markings: Yes

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Speedway Chrome SBC 350 Fluid Harmonic Balancer, 6.25 Inch

350, 6.25" Outside Diameter, 2.4375" Overall Thickness

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Outside Diameter: 6.25"

Overall Thickness: 2.4375"

Thickness: 1.25"

SFI Rating: 18.1

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Small Block Chevy 400 Harmonic Balancer, 8 Inch, Plain Steel

400, 8" Outside Diameter, Not SFI-approved SFI Rating

Outside Diameter: 8"

SFI Rating: Not SFI-approved

Weight: 12.59 lbs.

Material Type: Steel

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Speedway Chrome SBC 400 Fluid Harmonic Balancer, 7.25 Inch

400, 7.25" Outside Diameter, 18.1 SFI Rating, Steel

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Outside Diameter: 7.25"

SFI Rating: 18.1

Material Type: Steel

Engine Balance: External

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1981-95 SBF 302 4-Bolt Harmonic Balancer, 50 Oz.

302, 351W, 5.0L, 4.101" Overall Width, 9.69 lbs. Weight

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Overall Width: 4.101"

Weight: 9.69 lbs.

Material Type: Steel

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Fluidampr Balancers 550203 8BA Ford Flathead Harmonic Balancer

5.63" Outside Diameter, 18.1 SFI Rating, Steel, Chrome

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Outside Diameter: 5.63"

SFI Rating: 18.1

Material Type: Steel

Finish: Chrome

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Pro Race 31262 Pro/Sport 6.1 Inch SBC Harmonic Balancer Int Balanced

283, 302, 305, 307, 327, 350, 6.1" Outside Diameter

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Outside Diameter: 6.1"

Thickness: 1.52"

SFI Rating: 18.1

Weight: 5.4 lbs.

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Fluidampr Balancers 620101 SBC Harmonic Balancer, 6.25 Inch

262, 265, 267, 283, 302, 305, 307, 327, 350, Steel

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Outside Diameter: 6.25"

Overall Length: 2.335"

SFI Rating: 18.1

Weight: 7.90 lbs.

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Pro race 24264 Pro/Street 8 Inch 454 BBC Harmonic Balancer

454, 8" Outside Diameter, Not SFI-approved SFI Rating

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Outside Diameter: 8"

SFI Rating: Not SFI-approved

Weight: 11.4 lbs.

Engine Balance: Internal/External

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ATI 917781 Super Damper Std Harmonic Balancer, S/B Chevy Engines

Chevy Small Block V8, 6.325" Outside Diameter, Steel

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Outside Diameter: 6.325"

SFI Rating: 18.1

Weight: 9 lbs.

Material Type: Steel

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Fluidampr Balancers 600203 8BA Ford Flathead Harmonic Balancer

5.625" Outside Diameter, 18.1 SFI Rating, Steel, Chrome

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Outside Diameter: 5.625"

SFI Rating: 18.1

Weight: 6.00 lbs.

Material Type: Steel

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Pro race 24266 Pro/Street 8 Inch SBC Harmonic Balancer

400, 8" Outside Diameter, Not SFI-approved SFI Rating

Outside Diameter: 8"

SFI Rating: Not SFI-approved

Weight: 11.4 lbs.

Engine Balance: Internal/External

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Professional Products Small Block Chevy 6 Inch Harmonic Balancer, SFI

Chevy Small Block V8, 6.00" Outside Diameter, Steel

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Outside Diameter: 6.00"

SFI Rating: 18.1

Weight: 5.70 lbs.

Material Type: Steel

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EngineQuest BA289N SBF 3-Bolt Harmonic Balancer, 28 Oz.

289, 302, 351W, 6.375" Outside Diameter

Outside Diameter: 6.375"

SFI Rating: Not SFI-approved

Engine Balance: External

Degree Markings: Yes

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Pro Race 34269 Pro/Sport 6.61 Inch SBF Harmonic Balncer, External

289, 351C, 351M, 351W, 6.61" Outside Diameter

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Outside Diameter: 6.61"

SFI Rating: 18.1

Weight: 11.01 lbs.

Engine Balance: External

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Pro Race 34262 Pro/Sport 6.61 Inch SBC Harmonic Balancer

283, 302, 305, 307, 327, 350, 6.62" Outside Diameter

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Outside Diameter: 6.62"

SFI Rating: 18.1

Weight: 10.15 lbs.

Engine Balance: Internal

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

260, 289, 302, 351W, 5.0L, .95" Overall Thickness

Overall Thickness: .95"

Material Type: Aluminum

Finish: Natural

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Performance Racing Warehouse 2546001 Harmonic Balancer, Ford 429-460

429, 460, 7.25" Outside Diameter, 1.37" Inside Diameter

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Outside Diameter: 7.25"

Inside Diameter: 1.37"

Overall Thickness: 1.8"

SFI Rating: 18.1

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TCI 870009 Chrysler B/B V8 Int Balance Rattler Harmonic Balancer

$340.99
$402.20

361, 383, 400, 426 Wedge, 440, 426, 18.1 SFI Rating

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Outside Diameter: 7.17"

SFI Rating: 18.1

Material Type: Steel

Finish: Black powdercoated

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

260, 289, 302, 351W, 5.0L, .35" Thickness, Aluminum

Thickness: .35"

Material Type: Aluminum

Finish: Natural

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ATI 917320 Super Damper Harmonic Balancer

$349.99
$449.00

6.325" Outside Diameter, 18.1 SFI Rating

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Outside Diameter: 6.325"

SFI Rating: 18.1

Weight: 2.2 lbs.

Engine Balance: Internal

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TCI 870030 LS Internal balance Rattler

$342.99
$396.52

L76, L92, L99, LQ4, LQ9, LS1, LS2, LS3, LS6, LSA, LY6

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SFI Rating: 18.1

Material Type: Steel

Finish: Black anodized

Engine Balance: Internal

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Although they're simple in appearance, there's a lot of engineering packed into these devices. The Elastomer balancer makes use of a rubber-isolated steel ring to dampen crankshaft vibrations. The rubber lining converts harmonic waves into heat. This style is common on stock engines because it is cheaper to manufacture and performs well under known conditions. As various engine parts are altered and/or RPM increases, however, the harmonics in the engine can shift outside of the range this type of damper is designed for.

 

Fluid dampers use a flywheel suspended within a specialized fluid to dissipate harmful vibrations. Due to its greater ability to manage heat (remember: a damper converts vibration energy into heat), a fluid balancer is more effective across a wider operating range. Plus, all moving parts are fully self-contained, allowing it to meet SFI 18.1 safety ratings for extreme racing conditions. TCI's Rattler line is constructed in a similar way, except without the fluid. The Rattler is unique in its ability to absorb energy, rather than convert it to heat.

 

Generally, a longer stroke or greater torque requires a larger diameter harmonic balancer. Also, keep in mind that some engines are externally balanced and require a balancer with provisions for bolt-on weights. Finally, when replacing a harmonic balancer, don't forget these install/removal tools to ensure you don't damage the balancer or crankshaft.

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