Fuel Injector Clinic 660cc High Impedance Fuel Injector Set for LS3, LS7, LSA, L76, L92 & L99 Engines (IS303-0660H-SP)
Increase the fueling capacity of your GM Gen IV LS engine with the Fuel Injector Clinic IS303-0660H-SP injector set. Designed for LS3, LS7, LSA, L76, L92, and L99 applications, this complete set of eight saturated high impedance fuel injectors delivers the precision, consistency, and drivability enthusiasts expect from Fuel Injector Clinic. Whether your combination is naturally aspirated or boosted, these injectors provide excellent fuel control with outstanding idle quality and throttle response.
Manufactured using the latest injector technology, the IS303-0660H-SP features exceptional linearity and short pulse width repeatability for easier tuning and predictable performance. Every injector set is precisely flow matched to within 1%, individually serial numbered, and includes a detailed flow sheet. Plug and Play GM ECU calibration data is available directly from Fuel Injector Clinic, making calibration straightforward for supported engine management systems. Best of all, these injectors offer direct drop-in plug fitment with no wiring modifications required.
Quick Specs
- Manufacturer: Fuel Injector Clinic
- Part Number: IS303-0660H-SP
- Application: LS3, LS7, LSA, L76, L92, and L99 Engines
- Injector Quantity: Set of 8
- Injector Type: Saturated High Impedance (High-Z)
- Flow Rate: 660 cc/min (62 lb/hr) @ 43.5 PSI (3 Bar)
- Flow Rate: 765 cc/min (72 lb/hr) @ 58 PSI (4 Bar)
- Installation: Direct drop-in factory plug fitment
- Flow Matching: Precision matched to within 1%
- Flow Testing: Tested at 43.5 PSI (3 Bar) using CF-16B calibration fluid at 90 degrees Fahrenheit
- ECU Support: Plug and Play GM ECU calibration data available from Fuel Injector Clinic
- Included: Individual injector flow sheet
- Included: All required O-rings for the factory application
- Warranty: Lifetime manufacturer warranty
Features
- Designed for LS3, LS7, LSA, L76, L92, and L99 engine applications.
- Complete set of eight saturated high impedance fuel injectors.
- 660 cc/min (62 lb/hr) flow rate at 43.5 PSI (3 Bar).
- 765 cc/min (72 lb/hr) flow rate at the OE 58 PSI (4 Bar) fuel pressure.
- Direct drop-in factory plug fitment.
- No wiring modifications or adapter harnesses required.
- Latest Fuel Injector Clinic injector technology.
- Flow matched to within 1% for excellent cylinder-to-cylinder consistency.
- Each injector is individually serial numbered.
- Includes a detailed injector flow sheet.
- Excellent linearity and superior short pulse width control.
- Outstanding idle quality and drivability.
- Plug and Play GM ECU calibration data available.
- Includes all required O-rings for factory installation.
- Backed by Fuel Injector Clinic's lifetime manufacturer warranty.
Fitment
LS3 Engines
LS7 Engines
LSA Engines
L76 Engines
L92 Engines
L99 Engines
FAQs
Do these injectors require wiring modifications?
No. The IS303-0660H-SP features direct drop-in factory plug fitment, allowing installation with the factory electrical connectors.
Is calibration data available for these injectors?
Yes. Fuel Injector Clinic provides Plug and Play GM ECU calibration data for supported applications, helping simplify tuning and optimize drivability.
Why Buy From Beefcake Racing?
Beefcake Racing is an Authorized Fuel Injector Clinic dealer, providing genuine FIC fuel system components backed by expert technical support, competitive pricing, and fast shipping. Whether you're upgrading a street-driven LS3 or building a high-horsepower LSA-powered project, our experienced team can help you select the right injectors and supporting fuel system components.
Need help choosing the correct injector size for your build? Contact our knowledgeable team before placing your order.
Email: sales@beefcakeracing.com
Phone: 1-855-827-7223
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