Fuel Injector Clinic 1650cc High-Z Injector Set — 1999–2006 GM 4.8L / 5.3L / 6.0L Truck

Fuel Injector Clinic 1650cc High-Z Injector Set — 1999–2006 GM 4.8L / 5.3L / 6.0L Truck

Part Numbers: IS304-1650H & PGTJETR8Q

The Fuel Injector Clinic IS304-1650H is an application-specific set of eight high-impedance injectors for 1999–2006 GM 4.8L, 5.3L, and 6.0L truck engines. FIC rates each injector at 1650 cc/min and 160 lb/hr at its standard 3-bar test pressure of 43.5 psi. At the OE 4-bar / 58 psi fuel pressure used for this application, FIC rates each injector at approximately 1900 cc/min and 180 lb/hr.

This injector set uses Fuel Injector Clinic’s 1650cc high-impedance injector in the correct physical configuration for the listed GM truck application. The injectors use Jetronic/EV1 electrical connections rather than the original GM/Delphi harness connector used on the vehicle. FIC supplies solder-in Jetronic pigtails as the standard wiring option and offers an optional plug-and-play Jetronic/EV1-to-GM/Delphi adapter set for installations where cutting and soldering the factory harness is not desired.

FIC’s 1650cc high-impedance injector combines substantial fuel capacity with the short-pulse-width control required for stable idle and street drivability when the ECU is configured with the correct injector characterization data. The injector uses stainless-alloy valve construction and is compatible with pump gasoline, E85, Q16, VP Import, FTW, and other MTBE oxygenated racing fuels.

Each injector is individually serial numbered and matched using Fuel Injector Clinic’s Data Match Technology. The supplied Data Match Sheet provides measured flow-matching and latency information, and FIC provides plug-and-play GM ECU injector data through its technical-data library.

Key Features

• Set of eight Fuel Injector Clinic high-impedance injectors
• Application-specific fitment for 1999–2006 GM 4.8L, 5.3L, and 6.0L truck engines
• 1650 cc/min per injector at 43.5 psi / 3 bar
• 160 lb/hr per injector at 43.5 psi / 3 bar
• Approximately 1900 cc/min per injector at OE 58 psi / 4 bar fuel pressure
• 180 lb/hr per injector at OE 58 psi / 4 bar fuel pressure
• Saturated / high-impedance electrical design
• Jetronic/EV1 injector electrical connection
• Solder-in Jetronic pigtails supplied with the standard configuration
• Optional plug-and-play Jetronic/EV1-to-GM/Delphi harness adapters available
• Stainless-alloy valve construction
• Compatible with pump gasoline, E85, Q16, VP Import, FTW, and other MTBE oxygenated race fuels
• Fuel Injector Clinic Data Match Technology
• Each injector individually serial numbered
• Matched flow and latency information supplied on the Data Match Sheet
• Plug-and-play GM ECU injector data available from Fuel Injector Clinic
• Short-pulse-width control intended to support stable idle and street drivability with correct ECU data
• All O-rings required for the listed factory application included
• Fuel Injector Clinic lifetime warranty against defects in original manufacture

Kit Includes

• Eight Fuel Injector Clinic 1650cc high-impedance injectors
• Application-specific upper and lower O-rings for the listed factory installation
• Eight Jetronic quick-release solder-in pigtails when the standard PGTJETR8Q wiring option is selected
• Optional set of eight Jetronic/EV1-female to GM/Delphi-male plug-and-play adapters when PADPJtoGM8 is selected instead
• Individual injector serial numbers
• Fuel Injector Clinic Data Match Sheet with measured matching and latency information
• Access to applicable Fuel Injector Clinic GM ECU injector data

Technical Specifications

Flow and Test Conditions

• Nominal injector size: 1650 cc/min
• Flow at 43.5 psi / 3 bar: 1650 cc/min per injector
• Mass flow at 43.5 psi / 3 bar: 160 lb/hr per injector
• Flow at OE 58 psi / 4 bar: approximately 1900 cc/min per injector
• Mass flow at OE 58 psi / 4 bar: 180 lb/hr per injector
• FIC rating test temperature: 90°F fuel temperature
• FIC calibration fluid: CF-16B

Electrical and Mechanical Configuration

• Injector type: saturated / high impedance
• Quantity: eight injectors
• Injector connector: Jetronic/EV1
• Factory harness connector: GM/Delphi
• Standard wiring option: eight solder-in Jetronic quick-release pigtails, FIC part number PGTJETR8Q
• Optional wiring option: eight Jetronic/EV1-female to GM/Delphi-male plug-and-play adapters, FIC part number PADPJtoGM8
• Valve construction: stainless alloy
• Fitment: application-specific drop-in mechanical configuration for the listed 1999–2006 GM truck engines
• Application-specific O-rings are included
• Exact injector body length is not published on FIC’s current product page

Fuel Compatibility

• Pump gasoline
• E85
• Q16
• VP Import
• FTW
• Other MTBE oxygenated racing fuels identified as compatible by Fuel Injector Clinic

Injector Matching and ECU Data

• Matched using Fuel Injector Clinic Data Match Technology
• Each injector individually serial numbered
• Data Match Sheet supplied with measured matching results and latency information
• Plug-and-play GM ECU injector data available from Fuel Injector Clinic
• Correct injector characterization must be entered into the ECU for proper fueling, idle quality, transient response, and drivability

Available Wiring Configurations

• Solder-In Pigtails — PGTJETR8Q: set of eight Jetronic quick-release injector plugs with pigtails. This is FIC’s standard wiring selection for IS304-1650H and requires replacing the original injector connectors on the vehicle harness.
• Plug-and-Play Harness Adapters — PADPJtoGM8: set of eight Jetronic/EV1-female to GM/Delphi-male adapters. This option connects the injectors to the original GM/Delphi harness without cutting or soldering the vehicle wiring.

Application Notes

• Fuel Injector Clinic lists IS304-1650H specifically for 1999–2006 GM 4.8L, 5.3L, and 6.0L truck motors. Confirm the intake manifold, fuel rail, and injector configuration before ordering when the engine uses aftermarket induction components.
• The 1650cc rating is measured at 43.5 psi / 3 bar. The same injector flows approximately 1900 cc/min and 180 lb/hr at the application’s OE 58 psi / 4 bar fuel pressure.
• Injector flow changes with differential fuel pressure. Fuel-system sizing should be based on the actual regulated differential pressure and fuel type rather than the nominal 1650cc designation alone.
• These injectors use Jetronic/EV1 electrical connections. Select either the supplied solder-in pigtails or the optional plug-and-play GM/Delphi harness adapters according to the desired wiring approach.
• These injectors require appropriate ECU characterization. Use the FIC-supplied flow, latency, and characterization data rather than generic injector values.
• Fuel pumps, fuel-pressure regulator, fuel rails, filters, feed and return lines, ECU configuration, and other fuel-system components are not included.
• FIC supplies the O-rings required for the listed factory application. Aftermarket rails, intake manifolds, or unusual injector mounting arrangements may require different seals, spacers, or fitment hardware.
• This product is a port-fuel-injector set and is not a direct-injection injector replacement.

Emissions and Competition-Use Notice

Performance fuel-system modifications may affect vehicle emissions compliance and road-use legality. The purchaser and installer are responsible for determining that the completed vehicle complies with all applicable emissions, registration, fuel-system, and competition-use requirements.