Fuel Injector Clinic 1440cc High Impedance Fuel Injector Set (1999-2006 GM 4.8L / 5.3L / 6.0L Truck Engines) - IS304-1440H
When your high-performance GM truck build demands more fuel than a 1200cc injector can provide, but doesn't require stepping up to a 1650cc injector, the Fuel Injector Clinic IS304-1440H High Impedance Fuel Injector Set is the ideal solution. Designed specifically for 1999-2006 GM 4.8L, 5.3L, and 6.0L truck engines, this complete set of eight injectors flows 1440cc/min (140 lb/hr) at 43.5 PSI (3 Bar) and 1700cc/min (160 lb/hr) at the factory 58 PSI (4 Bar) fuel pressure. It delivers the fuel capacity needed for serious horsepower while maintaining excellent idle quality and outstanding street manners.
The IS304-1440H features Fuel Injector Clinic's latest high impedance injector technology with exceptional linearity and short pulse width repeatability for easier tuning and outstanding drivability. Built with a stainless alloy valve, these injectors are compatible with virtually every popular performance fuel, including gasoline, E85, VP Import, FTW, Q16, and other MTBE oxygenated race fuels, making them an excellent choice for both street and dedicated race applications.
Each injector set is precisely matched using Fuel Injector Clinic's proprietary Data Match Technology. Every injector is individually serial numbered and supplied with a detailed Data Match Sheet containing injector-specific flow and latency data for precise ECU calibration. Plug and Play GM ECU calibration data is also available from Fuel Injector Clinic for supported GM engine management systems.
This injector set includes PGTUSC8 injector pigtails for wiring harness conversion. If you prefer not to modify your factory harness, optional PADPUtoGM8 Plug and Play adapters are available separately for installation without cutting or soldering. Fuel Injector Clinic specifies this connector conversion because it utilizes brand-new, unused injectors instead of remanufactured or core-program injectors, providing maximum reliability and long-term performance.
Quick Specs
- Part Number: IS304-1440H
- Application: 1999-2006 GM 4.8L, 5.3L, and 6.0L Truck Engines
- Injector Quantity: 8
- Injector Flow Rate: 1440cc/min (140 lb/hr) at 43.5 PSI (3 Bar)
- Injector Flow Rate: 1700cc/min (160 lb/hr) at OE 58 PSI (4 Bar)
- Injector Type: High Impedance (Saturated)
- Stainless alloy valve construction
- Includes PGTUSC8 injector pigtails
- Optional PADPUtoGM8 Plug and Play adapters available
- Plug and Play GM ECU calibration data available
- Fuel Injector Clinic Data Match Technology
- Each injector individually serial numbered
- Detailed Data Match Sheet included
- Flow tested at 43.5 PSI (3 Bar)
- Tested using CF-16B calibration fluid at 90 degrees Fahrenheit
- Application-specific O-rings included
- Lifetime warranty against manufacturing defects
Features
- Designed specifically for 1999-2006 GM 4.8L, 5.3L, and 6.0L truck engines
- Flows 1440cc/min (140 lb/hr) at 43.5 PSI and 1700cc/min (160 lb/hr) at OE 58 PSI fuel pressure
- Ideal injector size between Fuel Injector Clinic's 1200cc and 1650cc offerings
- Excellent idle quality and street drivability while supporting substantial horsepower
- Compatible with gasoline, E85, VP Import, FTW, Q16, and other MTBE oxygenated race fuels
- Stainless alloy valve construction provides broad fuel compatibility
- Fuel Injector Clinic Data Match Technology ensures outstanding injector consistency
- Each injector is individually serial numbered with an included Data Match Sheet
- Latest high impedance injector technology with excellent short pulse width control
- Plug and Play GM ECU calibration data available for supported applications
- Includes PGTUSC8 injector pigtails for connector conversion
- Optional PADPUtoGM8 Plug and Play adapters allow installation without cutting or soldering
- Brand-new injectors eliminate the concerns associated with remanufactured core injectors
- Application-specific O-rings included for proper installation
- Backed by Fuel Injector Clinic's lifetime warranty against manufacturing defects
Fitment
- 1999 GM 4.8L Truck Engine
- 2000 GM 4.8L Truck Engine
- 2001 GM 4.8L Truck Engine
- 2002 GM 4.8L Truck Engine
- 2003 GM 4.8L Truck Engine
- 2004 GM 4.8L Truck Engine
- 2005 GM 4.8L Truck Engine
- 2006 GM 4.8L Truck Engine
- 1999 GM 5.3L Truck Engine
- 2000 GM 5.3L Truck Engine
- 2001 GM 5.3L Truck Engine
- 2002 GM 5.3L Truck Engine
- 2003 GM 5.3L Truck Engine
- 2004 GM 5.3L Truck Engine
- 2005 GM 5.3L Truck Engine
- 2006 GM 5.3L Truck Engine
- 1999 GM 6.0L Truck Engine
- 2000 GM 6.0L Truck Engine
- 2001 GM 6.0L Truck Engine
- 2002 GM 6.0L Truck Engine
- 2003 GM 6.0L Truck Engine
- 2004 GM 6.0L Truck Engine
- 2005 GM 6.0L Truck Engine
- 2006 GM 6.0L Truck Engine
Installation and Connector Information
This injector set requires changing the injector connectors on your engine wiring harness. The included PGTUSC8 pigtails can be soldered onto the factory harness, or optional PADPUtoGM8 Plug and Play adapters can be purchased separately to provide a true plug-and-play installation without cutting or soldering.
Fuel Injector Clinic specifies this connector conversion because it uses brand-new, unused injectors instead of remanufactured or core-program injectors, ensuring superior reliability, consistency, and long-term performance.
FAQs
Can these injectors be used with E85 and race fuels?
Yes. Thanks to their stainless alloy valve construction, the IS304-1440H injectors are compatible with gasoline, E85, VP Import, FTW, Q16, and other MTBE oxygenated race fuels.
Why choose the 1440cc injector over a larger size?
The 1440cc injector fills the gap between Fuel Injector Clinic's 1200cc and 1650cc injectors, providing additional fuel capacity while maintaining excellent idle quality, drivability, and tuning characteristics for both street and race applications.
Why Buy From Beefcake Racing?
Beefcake Racing proudly offers genuine Fuel Injector Clinic products backed by competitive pricing, fast shipping, and expert technical support. Whether you're building a street truck, drag truck, or high-horsepower race combination, our experienced team can help you select the right injectors and supporting fuel system components for your goals.
Questions about injector sizing or installation?
Email: sales@beefcakeracing.com
Phone: 1-855-827-7223
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