Gen 5 Gm LT V8 Stage 1 Injectors

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WHP Potential on Gasoline:
1200 WHP
WHP Potential on E85:
900 WHP
Tune Requirement:
Recommended Tuning Suite:
HP Tuners, EFI Live
Flow Rate Increase Over Stock LT4 injector:
Flow Rate Increase Over Stock LT1 injector:
Flow rate:
22.1 g/s @ 100 bar
Max Operating Pressure:
220 bar / 22MPa / 3190psi
What sets Nostrum apart:
  • Direct replacement injectors with no additional accessories needed for install   
  • OEM equivalent spray pattern  
  • 100% tested and batched sets, serialized   
  • +25% more flow than a stock LT4 injector / 45% more flow that stock LT1/L86 injector 
  • 220 bar max recommended operating pressure  
  • Ethanol compatible  
  • Easy to tune    
  • Tuning guide and HPTuners (HPT) calibration templates available 

Introducing the all new Nostrum upgraded Direct Injectors for the Gen V LT V8 family! Our Stage 1 injectors are plug and play and flow 25% more than the LT4 injectors, enough fuel to support 1200 WHP on gasoline or around 900 WHP on E85, all without methanol or port injection!  

Our injectors have an OEM equivalent spray pattern and are fully controllable with the factory engine management. Each injector is individually tested for flow at operating pressures and dynamically batched into sets with very little variance to ensure the best possible experience! 

Nostrum backs every part we sell with a limited lifetime warranty. All Nostrum products come complete with everything you need inside the box, including detailed installation instructions. Tuning guides are also available for your dealer or tuner. We have customer service and calibration engineers on staff to provide you with any support that you may need, from installation to tuning. 

Horsepower and Torque numbers are approximate and can vary significantly depending on numerous factors including what supporting upgrades are done to the vehicle, ambient temperature, elevation, road surface, tire selection & condition, fuel octane and quality, vehicle weight, and more.  The advertised numbers herein are based on optimal conditions and utilizing proper supporting modifications.  Your results may vary*

Why is spray pattern important?

While increasing flow rate is critical to making more horsepower, there are other factors to consider when choosing fuel system upgrades. A bigger injector isn’t always a better injector! It can flow a large volume of fuel at WOT, but if the spray pattern is poor, you can expect poor idle quality, poor drivability, increased knock propensity, soot, NVH (noise vibration harshness,) and tuning difficulty. Additionally, the wrong spray pattern can result in liquid fuel impinging in the cylinder walls, causing oil dilution, which increases mechanical wear to internal engine components.

Nostrum has invested significant time and resources into acquiring the equipment and machinery necessary to deliver an OEM level of quality on our injectors. Our spray patternation and arc flash machines (images below) give us an unparalleled look at how an OEM injector is designed and how it operates.  Our engineers design and develop injectors to optimally interact with engine air flow inside the combustion chamber to improve fuel evaporation and create a homogenous air-fuel mixture that results in a higher combustion quality. For you, this means that you can expect our injectors to perform at their absolute best regardless of what you are asking from them, from daily driver duty to setting new ¼ mile records.

Vehicle application list:
  • 2014-2019 Chevrolet Corvette (C7) 
  • 2014-2023 Chevrolet Silverado/GMC Sierra [2021+ vehicles must confirm not using 6mm stem injectors] 
  • 2014-2023 Chevrolet Tahoe/Suburban & Cadillac Escalade [2021+ vehicles must confirm not using 6mm stem injectors] 
  • 2016-2022 Chevrolet Camaro SS 
  • 2017-2023 Chevrolet Camaro ZL1 
  • 2016-2019 Cadillac CTS-V 

Recommended tuners: 

Frequently ask question: 

Q: Why don't I see horsepower gains with just a pump? Which comes first, pump or injectors?

A: Fundamentally we have to look at the entire fueling system and "where" in the rpm range the limits are. DI fuel systems in stock trim are often pump limited at middle rpm (peak torque) and injector limited at high rpm (peak power). This is due to engine speed. HPFPs are mechanically driven pumps (driven by the camshaft pump lobe spinning at ½ crank speed) and are RPM (engine speed) dependent. Many of the quoted flow increases in the aftermarket are purely displacement based comparisons: where by example the big bore pump has a piston diameter X% larger than the "stock" pump or the swept displacement ((3.14*(radius)^2)*(stroke))of the pump Y% larger than the stock pump. The larger displacement of the pump really shines in low rpm, where the fuel injector has plenty of time (crank angle degrees) to inject fuel. As the engines starts to approach peak power the engine speed starts to become quite short and is limiting the injection duration (crank angle degrees) for the injection event (which is another reason why we like to increase fuel pressure up high!).  


Limited Lifetime Warranty Policy Warranty only covers Nostrum manufactured products. (Distribution products are covered under original manufacturer’s warranty.) This policy is in force for products delivered after 01/01/2021. Warranty explicitly excludes the cost of labor for product installation and removal, diagnostics, or troubleshooting. Warranty does not cover items that have been tampered with, misused, improperly installed, or used in an improper application. Warranty may not apply to shipping damages. Warranty covers manufacturing defects: Damaged upon opening, not including shipping damages Broken connector Terminal loose Damaged or missing O-rings, combustion seals, or spacers Logs, tune files, and diagnostic results will be required before product is returned for the warranty replacement of all of Nostrum’s products. If a Nostrum product is assumed to have failed and sent in for a warranty claim, an inspection and performance test will be performed. If no fault is found there will be a Service Charge of $125.00 applied before the component is returned. Nostrum will replace at no charge any Nostrum product that is deemed under warranty. Warranty is non-transferable and limited to original purchaser for vehicle application. Customer must fill out Nostrum’s Return Material Authorization Form completely including product serial number for return to be accepted. Warranty applies only to items purchased directly through Nostrum High Performance or an authorized Nostrum High Performance Retailer or Distributor. Nostrum High Performance products purchased through authorized Retailers/Distributors are to be returned to and refunded by the retailer. Customer may be responsible for any shipping charges that may occur. In the case that a product is deemed defective and covered under warranty, Nostrum High Performance will pay ground shipping back to the customer. Apparel (T-Shirts, hats, etc.), mugs, and decals are not covered by this policy. Warranty is determined solely by Nostrum High Performance, and all product claims are to be inspected according to Nostrum High Performance standards.

1 Review

  • 5
    Lt4 injector uograde

    Posted by ANDY MAGES on Mar 14th 2023

    Work flawlessly

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