Fuel Injector Clinic 1200cc High-Z Injector Set — LS3 / LS7 / LSA / L76 / L92 / L99

Fuel Injector Clinic 1200cc High-Z Injector Set — LS3 / LS7 / LSA / L76 / L92 / L99

Part Numbers: IS303-1200H & PGTJETR8Q

The Fuel Injector Clinic IS303-1200H is an application-specific set of eight high-impedance injectors for LS3, LS7, LSA, L76, L92, and L99 engines. FIC rates each injector at 1200 cc/min and 110 lb/hr at its standard 3-bar test pressure of 43.5 psi. At the GM OE 4-bar / 58 psi fuel pressure used for these applications, FIC rates each injector at approximately 1350 cc/min and 130 lb/hr.

This injector set is mechanically configured for the listed GM applications and uses Jetronic/EV1 injector electrical connections. Because the factory harness uses the later USCAR/EV6-style connection, FIC supplies a set of eight solder-in Jetronic quick-release pigtails with the standard configuration. For installations where cutting and soldering the original vehicle harness is not desired, FIC offers a plug-and-play adapter set that converts the Jetronic/EV1 injector connection to the factory USCAR/EV6 harness connection.

FIC’s 1200cc high-impedance injector combines substantial fuel capacity with short-pulse-width control intended to support stable idle, transient fueling, and street drivability when the ECU is configured with the correct injector characterization data. Fuel Injector Clinic identifies its high-impedance injector range as suitable for both gasoline and E85 applications.

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. This injector was previously sold by FIC under the IS303-1100H designation.

Key Features

• Set of eight Fuel Injector Clinic high-impedance injectors
• Application-specific fitment for LS3, LS7, LSA, L76, L92, and L99 engines
• 1200 cc/min per injector at 43.5 psi / 3 bar
• 110 lb/hr per injector at 43.5 psi / 3 bar
• Approximately 1350 cc/min per injector at GM OE 58 psi / 4 bar fuel pressure
• 130 lb/hr per injector at GM OE 58 psi / 4 bar fuel pressure
• Saturated / high-impedance electrical design
• Jetronic/EV1 injector connection
• Solder-in Jetronic pigtails included with the standard configuration
• Optional plug-and-play Jetronic/EV1-to-USCAR/EV6 harness adapters available
• Compatible with gasoline and E85
• 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
• Previously sold as IS303-1100H

Kit Includes

• Eight Fuel Injector Clinic 1200cc high-impedance injectors
• Application-specific upper and lower O-rings for the listed factory installation
• Eight Jetronic quick-release solder-in pigtails, FIC part number PGTJETR8Q, with the standard wiring configuration
• 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: 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 GM OE 58 psi / 4 bar: approximately 1350 cc/min per injector
• Mass flow at GM OE 58 psi / 4 bar: 130 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 electrical connection: Jetronic/EV1
• Factory harness connection: USCAR/EV6-style
• Standard wiring option: eight solder-in Jetronic quick-release pigtails, FIC part number PGTJETR8Q
• Optional wiring option: eight Jetronic/EV1-female to USCAR/EV6-male plug-and-play adapters, FIC part number PADPJtoU8
• Fitment: application-specific configuration for LS3, LS7, LSA, L76, L92, and L99 engines
• Application-specific O-rings are included
• Exact injector body length is not published on FIC’s current IS303-1200H 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 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 configuration for IS303-1200H and requires replacing the original injector connectors on the vehicle harness.
• Plug-and-Play Harness Adapters — PADPJtoU8: set of eight Jetronic/EV1-female to USCAR/EV6-male adapters. This option connects the injectors to the factory harness without cutting or soldering the vehicle wiring.

Application Notes

• Fuel Injector Clinic lists IS303-1200H for LS3, LS7, LSA, L76, L92, and L99 engines. Confirm the intake manifold, fuel rail, and injector configuration before ordering when the engine uses aftermarket induction components.
• The 1200cc rating is measured at 43.5 psi / 3 bar. The same injector flows approximately 1350 cc/min and 130 lb/hr at the GM OE 58 psi / 4 bar fuel pressure.
• Injector flow changes with differential fuel pressure. Fuel-system sizing should be based on actual regulated differential pressure and fuel type rather than the nominal 1200cc designation alone.
• These injectors use Jetronic/EV1 electrical connections and therefore require either the supplied solder-in pigtails or the optional plug-and-play USCAR/EV6 harness adapters.
• 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.
• IS303-1200H is the standard 1200cc version and should not be confused with FIC’s separately cataloged IS303-1200H-D injector set.

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.