{"product":{"id":11142675398998,"title":"Nostrum GM Gen 5 LT V8 Stage 2 High Flow DI Injectors, Set of 8","body_html":"\u003ch2\u003eSummary\u003c\/h2\u003e\u003cp\u003eStage 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%.\u003c\/p\u003e\u003ch2\u003eBest For\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eAn LT build already pegged at Stage 1 duty cycle high in the rev range.\u003c\/li\u003e\n\u003cli\u003eBig turbo, large blower or heavy nitrous cars needing fuel headroom designed in from day one.\u003c\/li\u003e\n\u003cli\u003eOwners doing the whole job through direct injection rather than adding port injection and a controller.\u003c\/li\u003e\n\u003cli\u003eRace cars needing eight injectors matched tightly enough to trust cylinder to cylinder.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhen Stage 1 Is Not Enough Injector\u003c\/h2\u003e\u003cp\u003eThe 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.\u003c\/p\u003e\u003ch2\u003eEight Holes And Why The Spray Pattern Matters\u003c\/h2\u003e\u003cp\u003eA 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.\u003c\/p\u003e\u003ch2\u003eKey Specs\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eManufacturer: Nostrum High Performance\u003c\/li\u003e\n\u003cli\u003eProduct type: high flow direct injectors (DI), set of 8\u003c\/li\u003e\n\u003cli\u003eSKU: H750-1541\u003c\/li\u003e\n\u003cli\u003eFlow: 51% more than stock LT4, 71% more than stock LT1\/L86\u003c\/li\u003e\n\u003cli\u003eRail pressure target: 200 bar \/ 20 MPa \/ 2900 psi maximum\u003c\/li\u003e\n\u003cli\u003eSpray pattern: 8-hole, OEM compatible; sets batched to plus or minus 3%\u003c\/li\u003e\n\u003cli\u003eIncluded: direct-replacement set of eight, installation instructions, tuning guide and HP Tuners templates\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFitment And Setup Checks\u003c\/h2\u003e\u003cp\u003eA 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, \u003ca href=\"\/products\/nostrum-gen-5-gm-lt-v8-stage-1-injectors\"\u003eStage 1\u003c\/a\u003e is the better spend; other LT parts sit in the \u003ca href=\"\/collections\/chevrolet\"\u003eChevrolet collection\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003eVehicle Fitment\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e2014-2019\u003c\/td\u003e\n\u003ctd\u003eChevrolet Corvette (C7) including Z06\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2020-2021\u003c\/td\u003e\n\u003ctd\u003eChevrolet Corvette (C8)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2014-2023\u003c\/td\u003e\n\u003ctd\u003eChevrolet Silverado \/ GMC Sierra\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2014-2023\u003c\/td\u003e\n\u003ctd\u003eChevrolet Tahoe \/ Suburban and Cadillac Escalade\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2016-2022\u003c\/td\u003e\n\u003ctd\u003eChevrolet Camaro SS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2017-2023\u003c\/td\u003e\n\u003ctd\u003eChevrolet Camaro ZL1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2016-2019\u003c\/td\u003e\n\u003ctd\u003eCadillac CTS-V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eNostrum High Performance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eHigh flow direct injectors (DI), set of 8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eH750-1541\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEngine Application\u003c\/td\u003e\n\u003ctd\u003eGM Gen V LT V8 (LT1 \/ LT4 \/ L86)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlow Increase\u003c\/td\u003e\n\u003ctd\u003e51% over stock LT4; 71% over stock LT1\/L86\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlow Rate\u003c\/td\u003e\n\u003ctd\u003e26.7 g\/s at 100 bar (Viscor 16A); 2214 cc\/min at 100 bar (nHeptane)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Pressure\u003c\/td\u003e\n\u003ctd\u003e200 bar \/ 20 MPa \/ 2900 psi rail target\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpray Pattern\u003c\/td\u003e\n\u003ctd\u003eUnique 8-hole, OEM compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuel Compatibility\u003c\/td\u003e\n\u003ctd\u003eEthanol compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTune Requirement\u003c\/td\u003e\n\u003ctd\u003eYes; HP Tuners recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eLimited lifetime\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eIs the C8 Corvette really covered?\u003c\/h3\u003e\u003cp\u003eYes, for 2020-2021 cars confirmed not to be running 6mm stem injectors. LT2 engines on the 6mm stem need a different injector.\u003c\/p\u003e\u003ch3\u003eHow closely matched is a set?\u003c\/h3\u003e\u003cp\u003eSets are batched to within plus or minus 3%. That tolerance is what lets a tuner run tighter targets without chasing one cylinder.\u003c\/p\u003e\u003ch3\u003eCan I go straight to Stage 2 from stock?\u003c\/h3\u003e\u003cp\u003eYou 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.\u003c\/p\u003e","vendor":"Nostrum High Performance","product_type":"High Flow Direct Injectors","created_at":"2026-07-24T13:03:13+01:00","handle":"nostrum-gen-5-gm-lt-v8-stage-2-injectors","updated_at":"2026-09-08T19:46:50+01:00","published_at":"2026-07-24T17:57:55+01:00","template_suffix":null,"published_scope":"global","tags":"brand:nostrum-high-performance, Cadillac, Cadillac CTS-V, Cadillac Escalade, cat:fuel, Chevrolet, Chevrolet Camaro, Chevrolet Camaro SS, Chevrolet Camaro ZL1, Chevrolet Corvette, Chevrolet Corvette C7, Chevrolet Corvette C8, Chevrolet Silverado, Chevrolet Suburban, Chevrolet Tahoe, dept:performance-parts, fits:cadillac-escalade, fits:chevrolet-camaro, fits:chevrolet-corvette, fits:chevrolet-silverado, fits:chevrolet-suburban, fits:chevrolet-tahoe, fits:gmc-sierra, GM, GMC, GMC Sierra, make:cadillac, make:chevrolet, make:gm, make:gmc, type:high-flow-direct-injectors","variants":[{"id":54805987852630,"product_id":11142675398998,"title":"Default Title","price":"2942.46","sku":"H750-1541","position":1,"compare_at_price":"","fulfillment_service":"manual","inventory_management":null,"option1":"Default Title","option2":null,"option3":null,"created_at":"2026-07-24T13:03:13+01:00","updated_at":"2026-09-08T19:46:50+01:00","taxable":true,"barcode":null,"grams":0,"image_id":null,"weight":0.0,"weight_unit":"kg","requires_shipping":true,"quantity_rule":{"min":1,"max":null,"increment":1},"price_currency":"GBP","compare_at_price_currency":"","quantity_price_breaks":[]}],"options":[{"id":14231277109590,"product_id":11142675398998,"name":"Title","position":1,"values":["Default Title"]}],"images":[{"id":83087872819542,"product_id":11142675398998,"position":1,"created_at":"2026-07-24T16:01:54+01:00","updated_at":"2026-07-24T16:01:56+01:00","alt":"Nostrum Gen 5 GM LT V8 Stage 2 Injectors","width":386,"height":386,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/H603-1251-A1_-_LT_DI_Injectors_photo_07__76039__47804.1735538299_0ad5aee3-0ba3-488b-b89f-f84673875e6e.jpg?v=1784905316","variant_ids":[]}],"image":{"id":83087872819542,"product_id":11142675398998,"position":1,"created_at":"2026-07-24T16:01:54+01:00","updated_at":"2026-07-24T16:01:56+01:00","alt":"Nostrum Gen 5 GM LT V8 Stage 2 Injectors","width":386,"height":386,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/H603-1251-A1_-_LT_DI_Injectors_photo_07__76039__47804.1735538299_0ad5aee3-0ba3-488b-b89f-f84673875e6e.jpg?v=1784905316","variant_ids":[]}}}