Fuel Injector Clinic 1200cc High Impedance Fuel Injector Set (1999-2006 GM 4.8L / 5.3L / 6.0L Truck Engines) - IS304-1200H
Take the fuel system on your 1999-2006 GM 4.8L, 5.3L, or 6.0L truck engine to the next level with the Fuel Injector Clinic IS304-1200H High Impedance Fuel Injector Set. This complete set of eight injectors flows 1200cc/min (110 lb/hr) at 43.5 PSI (3 Bar) and 1350cc/min (130 lb/hr) at the factory 58 PSI (4 Bar) fuel pressure. Built with the latest injector technology, these injectors deliver exceptional linearity, outstanding short pulse width repeatability, and excellent drivability, making them an ideal choice for high-horsepower naturally aspirated, turbocharged, supercharged, and E85-capable applications.
The IS304-1200H injector set is precisely matched using Fuel Injector Clinic's proprietary Data Match Technology. Every injector is individually serial numbered and includes a comprehensive Data Match Sheet containing injector-specific flow and latency values for precise ECU calibration. Plug and Play GM ECU calibration data is also available from Fuel Injector Clinic, simplifying tuning on supported GM engine management systems. Previously sold as part number IS304-1100H.
This injector set includes PGTJETR8 injector pigtails for wiring harness conversion. If you prefer not to modify the factory harness, optional PADPJtoGM8 Plug and Play adapters are available separately for 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, providing superior reliability and long-term performance.
Quick Specs
- Part Number: IS304-1200H
- Previous Part Number: IS304-1100H
- Application: 1999-2006 GM 4.8L, 5.3L, and 6.0L Truck Engines
- Injector Quantity: 8
- Injector Flow Rate: 1200cc/min (110 lb/hr) at 43.5 PSI (3 Bar)
- Injector Flow Rate: 1350cc/min (130 lb/hr) at OE 58 PSI (4 Bar)
- Injector Type: High Impedance (Saturated)
- Includes PGTJETR8 injector pigtails
- Optional PADPJtoGM8 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 1200cc/min (110 lb/hr) at 43.5 PSI and 1350cc/min (130 lb/hr) at OE 58 PSI fuel pressure
- Latest high impedance injector technology delivers precise and consistent fuel delivery
- Excellent linearity and superior short pulse width repeatability
- Fuel Injector Clinic Data Match Technology ensures exceptional injector-to-injector consistency
- Each injector is individually serial numbered with an included Data Match Sheet
- Plug and Play GM ECU calibration data available for supported applications
- Includes PGTJETR8 injector pigtails for connector conversion
- Optional PADPJtoGM8 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
- Excellent idle quality, drivability, and simplified tuning
- Previously sold as IS304-1100H
- 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 PGTJETR8 pigtails can be soldered onto the factory harness, or optional PADPJtoGM8 Plug and Play adapters can be purchased separately for 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, helping ensure superior reliability, consistency, and long service life.
FAQs
Do these injectors require modifying the factory wiring?
Yes. The included PGTJETR8 pigtails replace the factory injector connectors. Optional PADPJtoGM8 Plug and Play adapters are available separately for a no-cut, no-solder installation.
What does "Previously IS304-1100H" mean?
Fuel Injector Clinic renamed this injector to IS304-1200H. It now reflects the injector's 1200cc/min flow rating while maintaining the same premium quality, Data Match Technology, and outstanding tuning characteristics.
Why Buy From Beefcake Racing?
Beefcake Racing proudly offers genuine Fuel Injector Clinic products backed by competitive pricing, fast shipping, and knowledgeable technical support. Whether you're building a boosted street truck or a dedicated race vehicle, our experienced team can help you select the right injectors and supporting fuel system components for your horsepower goals.
Questions about injector sizing or installation?
Email: sales@beefcakeracing.com
Phone: 1-855-827-7223
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