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Fluidampr Chevy 396-427 CID V8 w/ one 3/16 and one 1/4 key slot Steel Internally Balanced Damper

SKU: FDR800131

Harmonic Balancers

FDR Dampers - Domestic...

Fluidampr Chevy 396-427 CID V8 w/ one 3/16 and one 1/4 key slot Steel Internally Balanced Damper

SKU: FDR800131

Harmonic Balancers

FDR Dampers - Domestic...

A$1,255.11
LAST ONE! Est Ship 4-7 days. LAST ONE! This is the last unit at our distribution centre. Contact us if you need more. The ETA is the approximate time required to prepare your order for dispatch.
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Description

IMPORTANT NOTICE: Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.Reference Information Reference Data (Provide these details to our support team) Brand Name/s Fluidampr, Fluidamper StreetFX SKU fdr800131 SFX Item ID 4403633 Accounting SKU fdr-800131 Manufacturer SKU 800131 Manufacturer UPC 00815293001661 Alternative References 800131, FLU-800131, FLU800131

Harmonic Balancer - 8.000 in OD - Steel - Black - Internal Balance - Big Block Chevy - Each

Harmonic Balancer

Protect your engine. Modifications can compromise your stock harmonic balancer. Install a Fluidampr performance damper early for best durability. Superior viscous damper design controls harmful torsional vibration across the entire rpm range. Reduce wear on engine components. Reduce risk of crankshaft failure. Improve timing. Unleash lost torque and horsepower. Precision CNC machined and balanced high-grade steel components. Corrosion resistant black zinc finish with engraved timing marks. No maintenance required. Trusted by leading engine builders worldwide. SFI 18.1 certified. Made in USA.

Additional Information

Harmonic Balancer - Fluidampr - Big Block Chevy - Internal Balance - Dual Key, 3/16", 1/4" - Steel - Black Zinc Chromate - 8" dia - 15.3 lbs - SFI 18.1 - Made in USA - Each

Part Type

Engine Harmonic Balancer

Features and Benefits

  • Broad RPM range protection.
  • Made in USA.
  • No maintenance required.
  • Reduce risk of crankshaft failure.
  • Reduce wear on critical engine parts.
  • SFI 18.1 spec. Race proven for over 35 years.
  • Superior durability.
  • Unleash lost torque & horsepower.

Product Details

Bolt And Washer Included:No
Bore Dia. Min/Max:1.599 / 1.600
Degree Marking Range:50 BTDC to 10 ATDC. Additional timing/degree marks at 90, 180 and 270
Degree Markings:Engraved
Depth:2.685
Description:Fluidampr Harmonic Balancer
Engine Balance:Internal
Finish:Black Zinc
Grade Type:Performance
Inside Diameter:1.599
Keyway Spec:Dual; (3/16", 1/4")
Keyway Type:Yes
Keyway:Dual
Length:2.75
Material:Steel
Mounting Hardware Incl.:No
Mounting Hole Diameter:1.599
Mounting Hole Quantity:1
O.D.:8" (8.000)
Outside Diameter:8
Part Number:fdr800131
Safety Rating:SFI 18.1
TITLE:Fluidampr - 800131 - Harmonic Balancer - Fluidampr - BBC - Int Balance - Dual Key - Each
WT. in lbs.()=Rotating weight:15.5 (10.3 Rwt)
Weight / Rotating Weight:15.3 lbs / 10.2 lbs

Product Overview

Fluidampr Engine Dampers are designed to control destructive vibrations which are transfered thru the crankshaft.

Each time the air/fuel mixture inside a cylinder is ignited, the combustion that occurs creates a torque spike that is applied to the crankshaft through the piston and rod. This torque spike is so severe that it not only turns the crankshaft, it actually twists the crankshaft ahead of its normal rotation and then the crankshaft rebounds. This twisting action is known as torsional vibration. When these torque spikes and forces get into phase with the natural frequency, critical torsional harmonic vibrations occur and can be seriously destructive to the bearings and the crankshaft. Dampers are designed to control those destructive vibrations.

Critical harmonic vibrations occur numerous times in a engine's operating range. Stock rubber and elastomer-type dampers are frequency sensitive “tuned absorbers”, and work at only one critical frequency. In the case of a stock rubber damper, it is tuned for a factory engine's critical harmonic vibrations. If you change the mass of pistons, rods, or the crankshaft, you change the natural frequency of the crankshaft assembly; therefore, the stock damper is no longer tuned to the new frequency of vibration, and you may be headed for early failure of expensive engine components. Dampers also create heat while they work, and rubber is a poor dissipator of heat. This heat and the exposure to the elements deteriorates rubber, causing it to crack and change durometer, which then leads to inertia ring slippage, damper failure, uncontrolled torsional vibration, and costly engine parts breakage.

Additional Application Notes
• WT. in lbs.()=Rotating weight: 15.5 (10.3 Rwt) Same as #800101 but for crankshafts w/ dual keyways: (1) 3/16" and (1) 1/4" Safety Rating: SFI 18.1 O.D.: 8" (8.000) Mounting Hardware Incl.: No Material: Steel Length: 2.75 Keyway: Dual Finish: Black Zinc Engine Balance: Internal Degree Markings: Yes Degree Marking Range: 50 BTDC to 10 ATDC. Additional timing/degree marks at 90, 180 and 270 Bore Dia. Min/Max: 1.599 / 1.600

These additional application notes are supplied by the manufacturer and collated from multiple year ranges. Not all of these notes may apply to every year or every variant. Please contact a StreetFX agent for clarification if required.

Product Downloads

# Document Type Download
1. Installation Instructions

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

Data: v2 - Desc: v4.2 - Upd: 2026-10-13 19:51:20

Product Overview

Fluidampr Engine Dampers are designed to control destructive vibrations which are transfered thru the crankshaft. Each time the air/fuel mixture inside a cylinder is ignited, the combustion that occurs creates a torque spike that is applied to the crankshaft through the piston and rod. This torque spike is so severe that it not only turns the crankshaft, it actually twists the crankshaft ahead of its normal rotation and then the crankshaft rebounds. This twisting action is known as torsional vibration. When these torque spikes and forces get into phase with the natural frequency, critical torsional harmonic vibrations occur and can be seriously destructive to the bearings and the crankshaft. Dampers are designed to control those destructive vibrations. Critical harmonic vibrations occur numerous times in a engine’s operating range. Stock rubber and elastomer-type dampers are frequency sensitive “tuned absorbers”, and work at only one critical frequency. In the case of a stock rubber damper, it is tuned for a factory engine’s critical harmonic vibrations. If you change the mass of pistons, rods, or the crankshaft, you change the natural frequency of the crankshaft assembly; therefore, the stock damper is no longer tuned to the new frequency of vibration, and you may be headed for early failure of expensive engine components. Dampers also create heat while they work, and rubber is a poor dissipator of heat. This heat and the exposure to the elements deteriorates rubber, causing it to crack and change durometer, which then leads to inertia ring slippage, damper failure, uncontrolled torsional vibration, and costly engine parts breakage.


Features and Benefits

  • Broad RPM range protection.
  • Reduce risk of crankshaft failure.
  • Reduce wear on critical engine parts.
  • Unleash lost torque & horsepower.
  • No maintenance required.
  • Superior durability.
  • SFI 18.1 spec. Race proven for over 35 years.
  • Made in USA.

Product Details

Bolt And Washer Included:No
Bore Dia. Min/Max:1.599 / 1.600
Degree Marking Range:50 BTDC to 10 ATDC. Additional timing/degree marks at 90, 180 and 270
Degree Markings:Engraved
Depth:2.685
Description:Fluidampr Harmonic Balancer
Engine Balance:Internal
Finish:Black Zinc
Grade Type:Performance
Inside Diameter:1.599
Keyway Spec:Dual; (3/16", 1/4")
Keyway Type:Yes
Keyway:Dual
Length:2.75
Material:Steel
Mounting Hardware Incl.:No
Mounting Hole Diameter:1.599
Mounting Hole Quantity:1
O.D.:8" (8.000)
Outside Diameter:8
Part Number:fdr800131
Prop 65 (C, R, or CR):CR
Prop 65 - Short Label:CA-Prop65-label.jpg
Prop 65 Yes/No:Yes
Safety Rating:SFI 18.1
TITLE:Fluidampr - 800131 - Harmonic Balancer - Fluidampr - BBC - Int Balance - Dual Key - Each
WT. in lbs.()=Rotating weight:15.5 (10.3 Rwt)
Weight / Rotating Weight:15.3 lbs / 10.2 lbs

Application Summary

Chevy Big Block 396-427. Internal balance. Dual 3/16" and 1/4" keyways.

Part Type

Engine Harmonic Balancer

Data: v4.2 - Upd: 2026-09-29 00:44:09

Features

  • Broad RPM range protection.
  • Made in USA.
  • No maintenance required.
  • Reduce risk of crankshaft failure.
  • Reduce wear on critical engine parts.
  • SFI 18.1 spec. Race proven for over 35 years.
  • Superior durability.
  • Unleash lost torque & horsepower.

Specifications

Harmonic Balancer, Internal Balance, Steel, Black, Dual Key, Chevy, Big Block, Each

Using only three parts (a laser-welded sealed housing, an internal inertia ring, and highly viscous silicone fluid between the two), SFI-approved Fluidampr harmonic dampers can control all crankshaft vibration--not just a limited frequency range. As a result, you get reduced wear on the main bearings and timing gear, more stable valvetrain operation, and less chance of crank failure.

Product Attributes
BrandFluidampr
Manufacturer's Part Number800131
Part TypeHarmonic Balancers
Product LineFluidampr Harmonic Dampers
UPC815293001661
Engine BalanceInternal
SFI RatingSFI 18.1
Degree MarkingsYes
Degree Marking Range50 BTDC to 10 ATDC
Outside Diameter (in.)8.000
Keyway QuantityTwo
Harmonic Balancer MaterialSteel
Harmonic Balancer ConstructionFluid
Harmonic Balancer ColorBlack zinc chromate
Mounting Hardware IncludedNo
QuantitySold individually.
NotesDual keys, 3/16 and 1/4 in. Supercharger damper. Weight is 15.5 lbs.

Manufacturer Attributes
Bolt and Washer Included No
Mounting Hole Quantity 1
Title Fluidampr - 800131 - Harmonic Balancer - Fluidampr - BBC - Int Balance - Dual Key - Each
Safety Rating SFI 18.1
Outside Diameter 8"
Material Steel
Degree Marking Range 50 BTDC to 10 ATDC. Additional timing/degree marks at 90, 180 and 270
Keyway Type Dual; (3/16", 1/4")
Inside Diameter 1.599
Finish Black Zinc
Engine Balance Internal
Depth 2.685
Degree Markings Engraved
Weight / Rotating Weight 15.3 lbs / 10.2 lbs
Manufacturer Designation Harmonic Balancer - Fluidampr - BBC - Int Balance - Dual Key - Each
Product Class Engine Harmonic Balancer
Construction/Type Harmonic Balancer - Fluidampr - Big Block Chevy - Internal Balance - Dual Key, 3/16", 1/4" - Steel - Black Zinc Chromate - 8" dia - 15.3 lbs - SFI 18.1 - Made in USA - Each
Vehicle Designations Chevy Big Block 396-427. Internal balance. Dual 3/16" and 1/4" keyways.
Product Outline Broad RPM range protection.
Reduce risk of crankshaft failure.
Reduce wear on critical engine parts.
Unleash lost torque & horsepower.
No maintenance required.
Superior durability.
SFI 18.1 spec. Race proven for over 35 years.
Made in USA.
Vehicle Brief Fluidampr Performance Damper
Market Description Protect your engine. Modifications can compromise your stock harmonic balancer. Install a Fluidampr performance damper early for best durability. Superior viscous damper design controls harmful torsional vibration across the entire rpm range. Reduce wear on engine components. Reduce risk of crankshaft failure. Improve timing. Unleash lost torque and horsepower. Precision CNC machined and balanced high-grade steel components. Corrosion resistant black zinc finish with engraved timing marks. No maintenance required. Trusted by leading engine builders worldwide. SFI 18.1 certified. Made in USA.

Product Details

Bolt And Washer Included:No
Bore Dia. Min/Max:1.599 / 1.600
Degree Marking Range:50 BTDC to 10 ATDC. Additional timing/degree marks at 90, 180 and 270
Degree Markings:Engraved
Depth:2.685
Description:Fluidampr Harmonic Balancer
Engine Balance:Internal
Finish:Black Zinc
Grade Type:Performance
Inside Diameter:1.599
Keyway Spec:Dual; (3/16", 1/4")
Keyway Type:Yes
Keyway:Dual
Length:2.75
Material:Steel
Mounting Hardware Incl.:No
Mounting Hole Diameter:1.599
Mounting Hole Quantity:1
O.D.:8" (8.000)
Outside Diameter:8
Part Number:fdr800131
Prop 65 (C, R, or CR):CR
Prop 65 - Short Label:CA-Prop65-label.jpg
Prop 65 Yes/No:Yes
Safety Rating:SFI 18.1
TITLE:Fluidampr - 800131 - Harmonic Balancer - Fluidampr - BBC - Int Balance - Dual Key - Each
WT. in lbs.()=Rotating weight:15.5 (10.3 Rwt)
Weight / Rotating Weight:15.3 lbs / 10.2 lbs

Reference Information

Brand Name/s Fluidampr
StreetFX SKU fdr800131
SFX Item ID 4403633
Supplier Item Code 4403633
Manufacturer SKU 800131
Manufacturer UPC 815293001661
Alternative References FLU000085, FLU800131

Compatibility

Fluidampr Chevy 396-427 CID V8 w/ one 3/16 and one 1/4 key slot Steel Internally Balanced Damper
Year RangeMakeModelSubmodelsRegion
1963 Chevrolet Bel Air Base US
1965-1972 Chevrolet Bel Air Base US
1963 Chevrolet Biscayne Base US
1965-1972 Chevrolet Biscayne Base US
1969-1972 Chevrolet Brookwood Base US
1968-1972 Chevrolet C10 Pickup Base US
1968-1972 Chevrolet C10 Suburban Base US
1968-1972 Chevrolet C20 Pickup Base US
1968-1972 Chevrolet C20 Suburban Base US
1968-1972 Chevrolet C30 Pickup Base US
1967-1972 Chevrolet Camaro Base, RS, SS, Z28 US
2014-2015 Chevrolet Camaro Z/28 US
1966-1972 Chevrolet Caprice Base US
1965-1966 Chevrolet Chevelle Malibu Super Sport, Super Sport 396 US
1967 Chevrolet Chevelle Malibu CA
1967 Chevrolet Chevelle Concours, SS 396 US
1967 Chevrolet Chevelle 300 Deluxe CA
1968-1972 Chevrolet Chevelle 300, 300 Deluxe, Concours, Malibu, Nomad, SS 396, Concours Estate, Greenbrier, Base, SS, Heavy Chevy US
1968 Chevrolet Chevy II Nova US
1965-1969 Chevrolet Corvette Base US
2006-2013 Chevrolet Corvette Z06, 427 Limited Edition Z06, Z06 Carbon, 427 US
1966-1972 Chevrolet El Camino Base, Custom, SS US
1969-1970 Chevrolet Estate Base US
1963 Chevrolet Impala Base US
1965-1972 Chevrolet Impala Base, SS US
1968-1972 Chevrolet K10 Pickup Base US
1968-1972 Chevrolet K10 Suburban Base US
1968-1972 Chevrolet K20 Pickup Base US
1968-1972 Chevrolet K20 Suburban Base US
1968-1972 Chevrolet K30 Pickup Base US
1969-1972 Chevrolet Kingswood Base, Estate US
1970-1972 Chevrolet Monte Carlo Base US
1969-1972 Chevrolet Nova Base US
1972 Chevrolet P30 Van Base US
1969-1972 Chevrolet Townsman Base US

Please note that this information serves as a fitment guide only. For specific fitment questions or clarifications, please contact us, as manufacturers may introduce variations and modifications during model year or regional revisions. While we strive to provide accurate data, fitment details may vary by region; therefore, compatibility outside the listed region and submodel variant cannot be guaranteed.

Detailed Compatibility


Application Data
Application NotesSupercharged applications.
Beginning Year1965
Ending Year1970
Engine FamilyChevy big block Mark IV
Engine Size6.5L/396
Engine TypeV8
MakeCHEVROLET
Application NotesSupercharged applications.
Beginning Year1966
Ending Year1969
Engine FamilyChevy big block Mark IV
Engine Size7.0L/427
Engine TypeV8
MakeCHEVROLET
Application NotesSupercharged applications.
Beginning Year1970
Ending Year1972
Engine FamilyChevy big block Mark IV
Engine Size6.6L/402
Engine TypeV8
MakeCHEVROLET

This may not be an exhaustive list of compatible vehicles. Please reach out to one of our representatives if you are unsure or do not see your vehicle here.

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