Fuel Injector Clinic 1650cc High-Z Injector Set — LS1 / LS6

Fuel Injector Clinic 1650cc High-Z Injector Set — LS1 / LS6

Part Number: IS301-1650H

The Fuel Injector Clinic IS301-1650H is a set of eight high-impedance injectors for LS1 applications, using FIC’s application-specific drop-in configuration and factory-style electrical connector. 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 GM OE 4-bar / 58 psi fuel pressure used for this application, FIC rates each injector at approximately 1900 cc/min and 180 lb/hr.

FIC’s 1650cc high-impedance injector is designed to provide very high fuel capacity without requiring a low-impedance injector and separate peak-and-hold driver strategy. Fuel Injector Clinic specifically highlights the injector’s short-pulse-width control and idle behavior, making it suitable for high-output street-driven combinations 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. FIC describes the 1650cc as its largest high-impedance injector compatible with all race fuels.

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

Key Features

• Set of eight Fuel Injector Clinic high-impedance injectors
• Application-specific drop-in fitment for LS1 applications
• 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 GM OE 58 psi / 4 bar fuel pressure
• 180 lb/hr per injector at GM OE 58 psi / 4 bar fuel pressure
• Saturated / high-impedance electrical design
• Factory-style electrical connector with no plug conversion required
• 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
• Individual injector serial numbers
• Fuel Injector Clinic Data Match Sheet with 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 GM OE 58 psi / 4 bar: approximately 1900 cc/min per injector
• Mass flow at GM 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
• Electrical connector: factory-style connector for the listed application; no plug conversion required
• Valve construction: stainless alloy
• Fitment: application-specific LS1 drop-in configuration
• Application-specific O-rings are included
• Exact injector body length and connector-family designation are 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

Application Notes

• Fuel Injector Clinic lists IS301-1650H for LS1 engines and catalogs the application within its LS1 / LS6 injector family. Confirm the intake manifold, fuel rail, and injector configuration before ordering when the engine uses non-factory 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 actual regulated differential pressure and fuel type rather than the nominal 1650cc designation alone.
• These injectors require appropriate ECU injector characterization. Use the FIC-supplied flow, latency, and characterization data rather than generic injector values.
• Fuel pumps, fuel-pressure regulator, fuel rails, filters, lines, wiring, 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.