Katech Gen V LT Stage II DI High-Flow Fuel Injectors

Katech Gen V LT Stage II DI High-Flow Fuel Injectors

Maximum Fuel Delivery for High-Horsepower Gen V LT Direct-Injection Applications

The Katech Gen V LT Stage II DI High-Flow Fuel Injectors are engineered for high-horsepower Gen V GM LT engines requiring maximum fuel delivery beyond factory direct-injection injectors. Designed for aggressive naturally aspirated, supercharged, turbocharged, and competition-focused LT applications, these injectors support increased airflow and power demands while maintaining precise fuel control, drivability, and calibration resolution.

Katech Stage II DI Fuel Injectors are optimized for high-output LT engine combinations where increased fuel capacity, repeatability, and durability are critical. Each injector set is 100% tested, serialized, and dynamically matched to help ensure consistent cylinder-to-cylinder fuel delivery under high-pressure, high-load operating conditions.

These direct-injection fuel injectors are intended for maximum-effort street, track day, and competition-derived LT builds when paired with proper ECU calibration and a fuel system matched to the engine combination.

Features & Advantages

• Supplied as a Matched Set of Eight Direct-Injection Fuel Injectors
• Direct Replacement, Plug-and-Play Injectors Requiring No Additional Accessories for Installation in Compatible Applications
• 7.5 mm High-Flow Injector Design for Compatible Gen V LT Direct-Injection Fuel Systems
• Unique 8-Hole OEM-Compatible Spray Pattern for Excellent Drivability, Combustion Quality, and Calibration Stability
• 100% Tested at Operating Pressure and Dynamically Matched into Serialized Injector Sets
• 71% Greater Flow Capacity than Factory LT1/L86 Injectors
• 51% Greater Flow Capacity than Factory LT4 Injectors
• 200 Bar Maximum Recommended Operating Pressure
• Supports Up to 1,400 WHP on Gasoline and Up to 1,000 WHP on E85*
• Stage II Configuration for Maximum-Effort Street, Track, and Competition Applications
• Supports Increased Fuel Demand Beyond Factory Injectors
• Stable Low-Pulse Control for Improved Drivability and Calibration Accuracy
• Compatible with Gasoline and Ethanol-Based Fuels when Properly Calibrated
• Fully Controllable Through the Factory Engine Management System when Properly Calibrated
• Supported by HP Tuners and EFI Live Calibration Platforms
• Validated for High-Pressure, High-Temperature Operating Environments

Technical Overview

The Katech Gen V LT Stage II DI High-Flow Fuel Injectors are designed for compatible Gen V LT direct-injection engine platforms requiring maximum fuel capacity. Injector performance is validated to support stable operation across idle, part-throttle, and wide-open-throttle conditions when properly calibrated.

Each injector is individually tested at operating pressure and dynamically matched into serialized sets to minimize cylinder-to-cylinder variation. The Stage II injector design provides substantially increased fuel flow capacity compared to factory LT1, L86, and LT4 injectors while maintaining factory ECU controllability when properly calibrated.

Each set includes eight injectors for V8 Gen V LT applications. These high-flow direct-injection fuel injectors are intended for high-output engine combinations where accurate fuel delivery under load is essential to performance consistency, engine safety, and long-term reliability.

Why Spray Pattern Matters

Fuel flow capacity is only one component of injector performance. While increased fuel delivery is necessary to support higher horsepower levels, injector spray pattern plays a critical role in combustion efficiency, drivability, calibration stability, and long-term engine durability.

An injector with poor fuel atomization or an improperly designed spray pattern can contribute to poor idle quality, reduced throttle response, increased soot production, elevated knock sensitivity, calibration challenges, and increased noise, vibration, and harshness (NVH). Improper fuel targeting may also result in fuel contacting cylinder walls, potentially contributing to oil dilution and increased engine wear.

Katech Stage II Fuel Injectors feature a unique 8-hole OEM-compatible spray pattern designed to promote efficient fuel atomization and consistent fuel distribution within the combustion chamber. Combined with increased flow capacity and precise injector characterization, this helps maintain excellent drivability, combustion quality, and calibration control across a wide range of operating conditions.

Specifications & Performance Data

*Horsepower potential is dependent on complete engine combination, fuel system capacity, fuel type, operating pressure, supporting modifications, and calibration strategy. Advertised horsepower potential is based on properly calibrated applications and may vary.

Stage I vs. Stage II Injector Comparison

Choosing the right injector stage depends on engine combination, fuel type, target horsepower, supporting fuel system components, and calibration strategy.

What's Included

• Four (4) Bank 1 Matched and Serialized Direct-Injection Fuel Injectors
• Four (4) Bank 2 Matched and Serialized Direct-Injection Fuel Injectors
• Detailed Installation Instructions

Fitment & Applications

• Compatible Gen V GM LT Engine Platforms
• LT1, LT4, L83, L84, L86, and L87 Engine Applications (With 7.5 mm Injector Bores)
• 2014-2019 Chevrolet C7 Corvette
• 2014-2020 Chevrolet Silverado / GMC Sierra
• 2014-2020 Chevrolet Tahoe / Suburban / Cadillac Escalade
• 2016-2022 Chevrolet Camaro SS
• 2017-2023 Chevrolet Camaro ZL1
• 2016-2019 Cadillac CTS-V

Naturally Aspirated LT Engine Builds

Moderate Forced-Induction LT Engine Builds

Performance Street Vehicles

Track Day and Road Racing Applications

CRITICAL FITMENT NOTE! These injectors utilize a 7.5 mm injector stem design. They will NOT physically fit into newer Gen V cylinder heads equipped with 6 mm injector pockets.

• 2021-2024 model years (Including 2023-2024 6th-Gen Camaro SS and 2021+ Silverado, Sierra, Tahoe, Suburban, and Escalade) MUST be physically verified prior to ordering to ensure they are not equipped with the 6 mm injector stem design.
• These injectors are not compatible with LT2 applications (C8 Corvette), which exclusively utilize 6 mm injectors.

Final compatibility is dependent on engine configuration, cylinder head design, fuel system setup, power goals, and calibration strategy.

Tuning Requirements

Custom ECU calibration is required. These injectors are fully controllable through the factory engine management system when properly calibrated. Supported tuning platforms include HP Tuners and EFI Live.

Injector characterization data, calibration information, and tuning support resources are available to assist tuners during the calibration process.

Important Notes

• Custom ECU Calibration is Required for Proper Operation
• Injector Sizing Must Be Matched to Engine Airflow, Fuel Type, and Intended Power Level
• Not Intended for Use with Factory Fuel Calibration
• Additional Fuel System Upgrades May Be Required Depending on Engine Output
• Not Intended for LT2 Applications Equipped with 6 mm Stem Injectors

Installation Notes

• Professional Installation by a Qualified Technician Is Strongly Recommended
• Installation Applies to the Full Injector Set; Partial Replacement Is Not Recommended
• High-Pressure Fuel System Components Should Be Inspected Before Installation
• ECU Recalibration Is Mandatory Following Injector Installation

Why Choose Katech Fuel Injectors

Fuel delivery plays a critical role in engine performance, durability, and calibration accuracy. Katech Fuel Injectors are engineered to provide consistent fuel delivery and predictable performance in demanding Gen V LT applications. Validated for high-pressure direct-injection environments, they are designed to support increased engine output while maintaining the control required for reliable operation.

WARNINGS

Improper installation or calibration of fuel system components can result in fuel leaks, fire, engine damage, serious injury, or death.

This product must be installed and serviced only by trained professionals experienced with high-pressure direct-injection fuel systems.