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

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

Part Number: IS303-1200H-D

The Fuel Injector Clinic IS303-1200H-D 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.

The 1200cc-D version is the direct-plug configuration of FIC’s 1200cc injector for this application. Current application-specific listings identify the injector connection as USCAR/EV6/EV14-style, allowing connection to the factory-style harness without the solder-in Jetronic pigtails or plug adapters required by the standard IS303-1200H configuration.

FIC’s 1200cc-D high-impedance injector combines substantial fuel capacity with the short-pulse-width control required for 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 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.

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
• Direct-plug electrical configuration for the listed late-model LS applications
• Current application data identifies a USCAR/EV6/EV14-style injector connector
• No solder-in injector pigtails required for the factory-style harness connection
• 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

Kit Includes

• Eight Fuel Injector Clinic 1200cc-D high-impedance injectors
• Application-specific upper and lower O-rings for the listed factory installation
• 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
• Electrical connection: direct-plug configuration for the listed application
• Connector family: USCAR/EV6/EV14-style according to current application-specific retailer data
• Fitment: application-specific configuration for LS3, LS7, LSA, L76, L92, and L99 engines
• Application-specific O-rings are included
• Solder-in pigtails and connector adapters are not required for the factory-style harness connection
• Exact injector body length is not published on FIC’s current IS303-1200H-D 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
• FIC publishes separate 1200D calibration data for GM/HP Tuners, Holley, MaxxECU, and other supported ECU platforms
• Correct injector characterization must be entered into the ECU for proper fueling, idle quality, transient response, and drivability

Application Notes

• Fuel Injector Clinic lists IS303-1200H-D 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.
• The IS303-1200H-D is the direct-plug version of this application. The standard IS303-1200H uses a different injector electrical connection and requires pigtails or adapters for the factory harness.
• These injectors require appropriate ECU characterization. Use the FIC-supplied 1200D flow, latency, and characterization data rather than generic 1200cc injector values or data intended for the non-D 1200H injector.
• 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.