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Some products are made to order, imported or custom built. If timing matters, contact us before ordering and we will confirm the expected delivery timeframe.
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| Manufacturer | Nostrum High Performance |
| Product Type | High flow direct injectors (DI), set of 8 |
| SKU | H750-1541 |
| Engine Application | GM Gen V LT V8 (LT1 / LT4 / L86) |
| Flow Increase | 51% over stock LT4; 71% over stock LT1/L86 |
| Flow Rate | 26.7 g/s at 100 bar (Viscor 16A); 2214 cc/min at 100 bar (nHeptane) |
| Operating Pressure | 200 bar / 20 MPa / 2900 psi rail target |
| Spray Pattern | Unique 8-hole, OEM compatible |
| Fuel Compatibility | Ethanol compatible |
| Tune Requirement | Yes; HP Tuners recommended |
| Warranty | Limited lifetime |
Stage 2 sits at the top of Nostrum's Gen V LT injector ladder: eight direct injectors flowing 51% more than a stock LT4 injector and 71% more than the LT1 and L86 unit, using an industry-first 8-hole spray pattern developed to keep combustion quality intact at that flow. It suits an LT build that has used up Stage 1, or one specified from the start around a big turbo, blower or nitrous package on E85. Each injector is serialised and production tested for leak, static and dynamic flow and opening pressure, then batched into a set to within plus or minus 3%.
The difference between the stages is headroom, not character. Stage 1 lifts a stock LT4 by a quarter; Stage 2 lifts it by half, and Nostrum quotes the fuel system as able to support 1400 whp on gasoline or around 1000 whp on E85 once air handling, rotating assembly and calibration are up to it. The rail pressure target here is 200 bar rather than Stage 1's 220 bar: a bigger injector run slightly softer.
A bigger injector is not automatically a better one. Poor atomisation at high flow shows up as rough idle, knock sensitivity, soot and fuel washing the bores, which dilutes the oil. The 8-hole pattern keeps the charge homogeneous at Stage 2 flow while staying controllable by the factory engine management, which is why the set stays tunable on HP Tuners.
A calibration is required; Nostrum recommends HP Tuners. The check that matters is injector stem size: this set is for the 7.5mm LT1 and LT4 style bore, and Nostrum asks 2020-2021 C8 Corvette and 2021-onward Silverado, Sierra, Tahoe, Suburban and Escalade owners to confirm their engine is not already on 6mm stem injectors. The quoted whp figures are fuel-system capacity for a fully supported build. If your car is nowhere near them, Stage 1 is the better spend; other LT parts sit in the Chevrolet collection.
| 2014-2019 | Chevrolet Corvette (C7) including Z06 |
| 2020-2021 | Chevrolet Corvette (C8) |
| 2014-2023 | Chevrolet Silverado / GMC Sierra |
| 2014-2023 | Chevrolet Tahoe / Suburban and Cadillac Escalade |
| 2016-2022 | Chevrolet Camaro SS |
| 2017-2023 | Chevrolet Camaro ZL1 |
| 2016-2019 | Cadillac CTS-V |
For UK customers, prices include VAT, customs and delivery unless checkout states otherwise. For customers outside the UK, local customs and taxes remain your responsibility, and shipping is shown at checkout. If a shipping option is not available, email us and we will prepare a tailored quote.
Many of the products we sell are made to order, imported or custom built, so a lead time may apply. If you need a part urgently, contact us before ordering and we will confirm the expected delivery timeframe and process.
Yes, for 2020-2021 cars confirmed not to be running 6mm stem injectors. LT2 engines on the 6mm stem need a different injector.
Sets are batched to within plus or minus 3%. That tolerance is what lets a tuner run tighter targets without chasing one cylinder.
You can, and it makes sense if the build is already specified for serious power. On a milder car it is headroom you are not using, so check your logs with your tuner first.
Use the checked vehicle route, then confirm model year, engine, drivetrain, hardware and existing modifications on the product page or with our team before you commit.
Send us your vehicle, year, current setup and any fitting date, event, trip or deadline before ordering. We will help check fitment, product choice and timing.
