Fuel Injector Clinic 1200cc High-Z Injector Set — 1999–2006 GM 4.8L / 5.3L / 6.0L Truck

Fuel Injector Clinic 1200cc High-Z Injector Set — 1999–2006 GM 4.8L / 5.3L / 6.0L Truck

Part Numbers: IS304-1200H & PGTJETR8Q

The Fuel Injector Clinic IS304-1200H is an application-specific set of eight high-impedance injectors for 1999–2006 GM 4.8L, 5.3L, and 6.0L truck engines. FIC’s standard product configuration is IS304-1200H & PGTJETR8Q, which includes eight Jetronic quick-release solder-in pigtails. For installations where cutting and soldering the original injector harness is not desired, FIC also offers the PADPJtoGM8 plug-and-play adapter set.

Each injector is rated at 1200 cc/min and 110 lb/hr at FIC’s standard 43.5 psi / 3 bar test pressure. At the OE 58 psi / 4 bar fuel pressure used for this application, FIC rates each injector at approximately 1350 cc/min and 130 lb/hr.

The injectors use a saturated / high-impedance design and are engineered for strong linearity and short-pulse-width repeatability. FIC provides plug-and-play GM ECU injector data and matches each set using its Data Match Technology to support accurate fueling, stable idle, and predictable drivability when the ECU is configured with the correct injector characterization.

Each injector is individually serial numbered, and the supplied Data Match Sheet provides measured flow-matching and latency information. FIC flow-tests and rates the injectors at 43.5 psi / 3 bar with fuel at 90°F using CF-16B calibration fluid.

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
• Standard FIC product configuration: IS304-1200H & PGTJETR8Q
• 1200 cc/min / 110 lb/hr per injector at 43.5 psi / 3 bar
• Approximately 1350 cc/min / 130 lb/hr per injector at OE 58 psi / 4 bar
• Saturated / high-impedance electrical design
• Standard configuration includes eight Jetronic quick-release solder-in pigtails, PGTJETR8Q
• Optional PADPJtoGM8 plug-and-play stock-harness adapter set available
• Fuel Injector Clinic Data Match Technology
• Each injector individually serial numbered
• Data Match Sheet with flow-matching and latency information included
• Plug-and-play GM ECU injector data available from Fuel Injector Clinic
• Strong linearity and short-pulse-width repeatability for accurate low-pulse fueling
• All O-rings required for the listed factory application included
• Compatible with gasoline and E85
• Fuel Injector Clinic lifetime warranty against defects in original manufacture
• Previously sold as IS304-1100H

Kit Includes

• Eight Fuel Injector Clinic 1200cc high-impedance injectors, IS304-1200H
• Eight Jetronic quick-release solder-in pigtails, PGTJETR8Q, with the standard configuration
• Application-specific injector O-rings
• Individual injector serial numbers
• Fuel Injector Clinic Data Match Sheet with flow-matching and latency information
• Access to applicable Fuel Injector Clinic GM ECU injector data

Technical Specifications

Flow and Test Conditions

• Nominal injector size: 1200 cc/min
• Flow at 43.5 psi / 3 bar: 1200 cc/min per injector
• Mass flow at 43.5 psi / 3 bar: 110 lb/hr per injector
• Flow at OE 58 psi / 4 bar: approximately 1350 cc/min per injector
• Mass flow at OE 58 psi / 4 bar: 130 lb/hr per injector
• FIC test pressure: 43.5 psi / 3 bar
• FIC test fuel temperature: 90°F
• FIC calibration fluid: CF-16B

Electrical and Mechanical Configuration

• Injector type: saturated / high impedance
• Quantity: eight injectors
• Standard wiring configuration: IS304-1200H & PGTJETR8Q
• Included standard pigtails: eight Jetronic quick-release connectors with solder-in leads
• Optional plug-and-play configuration: IS304-1200H & PADPJtoGM8
• PADPJtoGM8 adapter interface: Jetronic / EV1 female to GM / Delphi male
• Application-specific O-rings included
• Exact injector body length is not published on FIC’s current IS304-1200H product page

Fuel Compatibility

• Gasoline
• E85

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 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 — IS304-1200H & PGTJETR8Q: FIC’s standard configuration. Includes eight Jetronic quick-release pigtails for replacing the existing injector connectors on the vehicle harness.
• Plug-and-Play Stock-Harness Adapters — IS304-1200H & PADPJtoGM8: uses eight Jetronic / EV1-female to GM / Delphi-male adapters, allowing connection to the factory-style harness without cutting or soldering the original injector wiring.

Application Notes

• Fuel Injector Clinic lists IS304-1200H specifically for 1999–2006 GM 4.8L, 5.3L, and 6.0L truck motors.
• The 1200cc rating is measured at 43.5 psi / 3 bar. At the OE 58 psi / 4 bar fuel pressure, FIC rates the same injector at approximately 1350 cc/min and 130 lb/hr.
• Injector flow changes with differential fuel pressure. Fuel-system sizing should be based on actual regulated differential pressure, fuel type, target power, and injector duty cycle rather than the nominal 1200cc designation alone.
• The standard IS304-1200H & PGTJETR8Q configuration requires replacing the existing injector connectors with the included solder-in pigtails.
• The optional IS304-1200H & PADPJtoGM8 configuration retains the factory-style harness connectors by using plug-and-play adapters.
• This injector set was previously sold by FIC as IS304-1100H.
• Use FIC-supplied injector characterization and latency data rather than generic 1200cc injector values.
• Fuel pumps, fuel-pressure regulator, fuel rails, filters, feed and return plumbing, ECU, ECU configuration, and tuning are not included.
• FIC supplies the O-rings required for the listed factory application. Aftermarket or unusual rail and manifold combinations should be checked for injector fitment before ordering.
• This 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.