Fluidampr Chevy LS1 / LS6 Corvette Steel Internally Balanced Damper

SKU: FDR740121

Harmonic Balancers

FDR Dampers - Domestic

Fluidampr

Fluidampr Chevy LS1 / LS6 Corvette Steel Internally Balanced Damper

SKU: FDR740121

Harmonic Balancers

FDR Dampers - Domestic

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

Protect your Corvette, CTS-V, or G8 LS engine from harmful torsional vibration with a Fluidampr viscous damper designed for high-performance street and racing applications. Increased cylinder pressure, RPM and rotating assembly changes can reduce the effectiveness of stock elastomer-style dampers. Fluidampr viscous damping technology helps control crankshaft harmonics across the entire RPM range to support long-term engine durability, accessory drive stability and reduced wear on critical components. Application summary: 1997-2004 Chevy Corvette / 2004-2007 Cadillac CTS-V / 2008-2009 Pontiac G8. LS engine. Fitment note: Pinning recommended for high-horsepower and supercharged applications. Fluidampr Pin Kit p/n 300004 available separately. Fitment note: Compatible with LS accessory drives using 1.500" crank pulley offset spacing. Fitment note: Does not fit dry sump applications.

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 engineâ€™s operating range. Stock rubber and elastomer-type dampers are frequency sensitive â€œtuned absorbersâ€, and work at only one critical frequency. In the case of a stock rubber damper, it is tuned for a factory engineâ€™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:	1.4818 / 1.4828
Degree Marking Range:	None
Degree Markings:	No
Depth:	2.838
Description:	Fluidampr Harmonic Balancer
Drive Belt Type:	Serpentine
Engine Balance:	Internal
Finish:	Black Zinc
Inside Diameter:	1.4795
Keyway Type:	No
Keyway:	None
Length:	2.838
Material:	Steel
Mounting Hardware Incl.:	No
Mounting Hole Quantity:	1
O.D.:	7-1/2" (7.500)
Outside Diameter:	7-1/2"
Part Number:	fdr740121
Prop 65 (C, R, or CR):	CR
Prop 65 - Short Label:	CA-Prop65-label.jpg
Prop 65 Yes/No:	Yes
Pulley Bolt Pattern:	Not compatible with supercharged applications.
Pulley Groove Quantity:	4 rear, 6 front
Safety Rating:	SFI 18.1
Title:	Fluidampr - 740121 - Harmonic Balancer - Fluidampr - LS SBC-97-04 Corvette/04-07 Cadillac CTSV - Each
WT. in lbs.()=Rotating weight:	10.9 (7.3 Rwt)
Weight / Rotating Weight:	10.9 lbs / 7.3 lbs

Application Summary

1997-2013 Chevy Corvette / 2004-2007 Cadillace CTS-V / 2008-2009 Pontiac G8 LS base engine.

Part Type

Engine Harmonic Balancer

Data: v4.2 - Upd: 2026-10-12 09:21:00

Features

Broad RPM range viscous damping protection.
Controls harmful torsional vibration in LS engine applications.
Made in the USA.
Maintenance free design with no tuning or rebuilds required.
Precision CNC machined steel construction.
SFI 18.1 spec. Race proven for over 40 years.
Supports crankshaft durability in high-performance street and racing applications.

Specifications

Product Attributes - UPC: 815293002101
Product Attributes - Brand: Fluidampr
Product Attributes - Notes: Not intended for supercharger applications. Designed for LSX/LXX applications.
Product Attributes - Quantity: Sold individually.
Product Attributes - Part Type: Harmonic Balancers
Product Attributes - SFI Rating: SFI 18.1
Product Attributes - Product Line: Fluidampr Harmonic Dampers
Product Attributes - Engine Balance: Internal
Product Attributes - Degree Markings: Yes
Product Attributes - Keyway Quantity: None
Product Attributes - Degree Marking Range: 50 BTDC to 10 ATDC
Product Attributes - Outside Diameter (in.): 7.500 in.
Product Attributes - Harmonic Balancer Color: Black zinc chromate
Product Attributes - Harmonic Balancer Material: Steel
Product Attributes - Manufacturer's Part Number: 740121
Product Attributes - Mounting Hardware Included: No
Product Attributes - Harmonic Balancer Construction: Fluid
Product Attributes - Crankshaft Pulley Bolt Hole Quantity: Three

Reference Information

Brand Name/s	Fluidampr
StreetFX SKU	fdr740121
SFX Item ID	4403618
Supplier Item Code	4403618
Manufacturer SKU	740121
Manufacturer UPC	815293002101
Alternative References	FLU740121, FLU000078, LS1, LS6