FUEL INJECTOR CLINIC IS303-1000H Fic Ls Injectors Set 1000CC

( Brand: Fuel Injector Clinic ), ( Type: Fuel Injector ), ( Connector Color: Black ), ( Manufacturer Warranty: 1 Year ), ( Vintage Part: No ), ( Item Weight: 8 Lb ), ( Performance Part: Yes )

Review FUEL INJECTOR CLINIC Fic 1000cc Ls Injectors Set Of Like New

The **Fuel Injector Clinic IS303-1000H FIC 1000cc LS Injectors Set** represents a premium, high-performance upgrade designed specifically for GM s legendary **LS-series engines**, including the **LS1, LS2, LS3, LS6, LS7, LS9, and LSA**, as well as select **L92/LT1** applications. Engineered to deliver unmatched fuel delivery precision, this **1000cc (1000 cubic centimeter) flow rate** set is meticulously crafted for high-output builds, forced induction setups, or even naturally aspirated engines pushing beyond stock limitations. Each injector in this set adheres to **OEM LS-series specifications** while incorporating **Fuel Injector Clinic s proprietary FIC (Fuel Injector Clinic) technology**, which enhances durability, response time, and overall reliability under extreme conditions. Built with **high-flow, high-pressure capabilities**, these injectors are capable of handling **up to 1,000cc of fuel per minute** at 60 psi, making them ideal for engines producing **500 horsepower** and beyond, whether running **turbocharging, supercharging, or aggressive nitrous oxide setups**. Constructed from **high-grade stainless steel and precision-machined components**, the injectors feature **sealed O-rings, reinforced solenoids, and optimized internal flow paths** to ensure consistent atomization and minimal fuel waste, reducing the risk of carbon buildup and injector failure over time. The **FIC 1000cc set** is backward-compatible with most **LS-series fuel rail systems**, though proper rail pressure regulation and fuel system support (such as upgraded fuel pumps, high-flow fuel filters, and proper ECU tuning) are strongly recommended to fully realize their potential. Whether you're chasing **street performance, drag racing, or high-end tuning**, this injector set provides the **consistency, power, and longevity** required to push your LS engine to its absolute limits while maintaining reliability in the most demanding applications.

### **Pros and Cons of buying a Fuel Injector Clinic IS303-1000H FIC 1000cc LS Injector Set**

1. **High-Quality Manufacturing** The IS303-1000H injectors are designed for performance applications, often using precision-engineered components to ensure durability and consistent fuel delivery. They are built to handle higher flow rates and pressures, making them suitable for modified engines.

2. **LS Engine Compatibility** These injectors are specifically designed for **LS-series engines (LS1, LS2, LS3, LS6, LS7, etc.)**, which are common in high-performance builds. Their flow rates (typically around **1000cc per injector**) align well with naturally aspirated and forced-induction LS applications.

3. **Better Fuel Atomization** The **FIC (Fuel Injection Control) technology** in these injectors improves fuel atomization, leading to more efficient combustion, better throttle response, and reduced carbon buildup compared to stock injectors.

4. **Higher Flow Capacity** At **1000cc**, these injectors can handle significant power outputs, making them ideal for **turbocharged, supercharged, or high-RPM applications** without running lean.

5. **Compatibility with ECU Tuning** Many performance tuners (such as **Haltech, Link, or custom ECUs**) support these injectors, allowing for precise fuel delivery adjustments. They work well with **standalone ECUs** and **OBD-II tuners**.

6. **Durability & Longevity** High-quality injectors like these are built to last longer than stock units, especially when properly maintained (regular cleaning, fuel system upgrades).

7. **Wider Availability of Parts & Support** Since these injectors are popular in the performance community, replacement parts (O-rings, seals, gaskets) and diagnostic tools are readily available.

8. **Improved Reliability Over Stock Injectors** Stock LS injectors (especially on older engines) can suffer from **clogging, inconsistent flow, or failure under high loads**. Upgrading to these injectors reduces those risks.

9. **Better for Ethanol & Alternative Fuels** The **ceramic or stainless steel internals** in some versions resist corrosion better than stock injectors, making them more compatible with **E85 or other fuel blends**.

10. **Aftermarket & Tuner Support** Many performance shops and tuners recommend these injectors for **LS-based builds**, ensuring compatibility with aftermarket components like **intake manifolds, fuel pumps, and intercoolers**.

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1. **Higher Upfront Cost** These injectors are **significantly more expensive** than stock LS injectors (typically **$150 $300 per injector** depending on quantity and brand). A full set (4 injectors) can cost **$600 $1,200 **, which is a major investment.

2. **Requires ECU Tuning** Unlike stock injectors, these high-flow injectors **cannot be used with stock ECUs** without causing **rich or lean conditions**. You ll need a **performance ECU (Haltech, Link, etc.) or a tunable OBD-II device** to properly map fuel delivery.

- A **high-flow fuel pump** (e.g., **EFI, Walbro, or Spectre**)

- **Upgraded fuel lines & filters**

- A **larger fuel tank** if running long-duration high-power setups

- Possibly a **cooling system upgrade** (if running forced induction)

4. **Potential for Carbon Buildup** If the **intake valves, ports, or combustion chamber** are not cleaned regularly, **carbon deposits** can form, reducing performance. This requires **periodic valve cleaning (e.g., with a carb cleaner or professional service)**.

5. **Installation Complexity** Replacing injectors requires **removing the intake manifold, fuel rail, and ECU wiring harness**, which can be time-consuming. If not done correctly, **air leaks or improper connections** can occur.

6. **Risk of Over-Tuning** If the **fuel system is not properly matched** (e.g., weak fuel pump, clogged filters), the injectors may **run rich**, leading to **wasted fuel, poor efficiency, or even damage** if the engine is forced to run too lean.

7. **Not Ideal for Low-Power Applications** If your engine is **naturally aspirated and low-power (e.g., stock LS1 with minimal mods)**, these injectors are **overkill** and may not provide noticeable benefits while increasing cost.

8. **Potential for Injector Failure Under Extreme Conditions** While durable, **extreme boost levels, poor fuel quality, or lack of maintenance** can still lead to **injector failure** over time.

9. **Compatibility Issues with Some ECUs** Some **stock or basic OBD-II ECUs** may not support these injectors without **third-party tuning software**, requiring additional investment.

10. **Resale Value Depreciation** High-performance injectors (especially aftermarket brands) **lose value quickly** compared to stock parts, so they are not a great long-term investment if you plan to sell the car later.

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### **Conclusion & Recommendation**

The **Fuel Injector Clinic IS303-1000H FIC 1000cc LS Injector Set** is one of the **best aftermarket options** for **LS-based performance builds**, especially for **turbocharged, supercharged, or high-RPM applications**. They offer **superior flow, reliability, and tuning flexibility** compared to stock injectors, making them a **strong choice for serious builders**.

**A performance ECU or tunable OBD-II device**

**A high-flow fuel system (pump, lines, tank)**

**Proper tuning and maintenance**

**A budget for additional upgrades (cooling, intake, etc.)**

#### **Who Should Buy These Injectors?**

**Turbocharged or supercharged LS builds** (especially with **boost levels above 10 15 psi**)

**High-RPM naturally aspirated engines** (e.g., **LS3, LS7, LS9** with forced induction)

**Builders using a standalone ECU** (Haltech, Link, AEM, etc.)

**Those who want long-term reliability** over stock injectors

#### **Who Should Avoid These Injectors?**

**Stock or lightly modified NA LS engines** (unless paired with a **high-flow fuel pump and ECU**)

**Budget-conscious builders** (they are **expensive** and require additional upgrades)

**Those without tuning experience** (risk of **rich/lean issues** without proper setup)

**Short-term builds or drag race cars** (resale value is low)

If you are **seriously modifying an LS engine** (especially with **forced induction**) and have the **budget for a full fuel system upgrade**, the **IS303-1000H FIC injectors are an excellent choice**. They provide **better performance, reliability, and tuning flexibility** than stock units.

However, if you are on a **tight budget or only doing minor mods**, consider **lower-flow injectors (e.g., 600 800cc)** or **stock injectors with a high-flow fuel pump** instead.

- A **high-quality ECU tuner** (Haltech, Link, or custom)

- A **high-flow fuel pump** (e.g., **EFI 1000 LPHP**)

- **Upgraded fuel lines & filters**

- **Regular fuel system maintenance** (cleaning, fuel additives)

**Verdict:** **Worth the investment for serious LS performance builds, but not necessary for mild mods.**

Details:

Low miles on the Injectors just going bigger that's only reason for selling.

part #: is303-1000h prices

• $845.99-$905.52

specifications carfuelinjector:

• brand: Fuel Injector Clinic
• type: Fuel Injector
• connector color: Black
• manufacturer warranty: 1 Year
• vintage part: No
• item weight: 8 Lb
• performance part: Yes

shipping carFuelInjector:

• transit: 4-9 Days
• type: Calculated
• class: Standard
• carrier: USPS
• service: USPS Ground Advantage
• cost: $7.46

payments carFuelInjector:

• credit card: Diners-club
• wallet: Google-pay
• other

returns carFuelInjector:

• policy: No Returns

offer carFuelInjector:

• best offers: True
• availability: In Stock
• started: April 9, 2026
• sold: 0
• options: Ship-to-home
• quantity: 1

seller carFuelInjector:

• # reviews: 64
• rating: 100.0%
• city: Jackson, Michigan

general carFuelInjector:

• condition: Used
• Air Fuel Delivery > Fuel Injection Parts > Fuel Injectors

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