{"product":{"id":11142675235158,"title":"Nostrum GM LS COPO and Holley Hi-Ram 670cc PFI Injectors, Set of 8","body_html":"\u003ch2\u003eSummary\u003c\/h2\u003e\u003cp\u003eEight Nostrum 670cc port fuel injectors built for GM LS engines running a Holley Hi-Ram intake, including LS COPO-style race builds on that manifold. The Hi-Ram puts the injector bosses a long way back from the valve, and a generic port injector aimed for a stock-height manifold will happily wet the runner wall instead of the port. These are spray targeted for that intake, so all 670cc\/min (63.8 lb\/hr) per injector goes where the tuner expects it. Tuning data is available from Nostrum on request or through a Nostrum dealer, which takes a lot of guesswork out of the first dyno session.\u003c\/p\u003e\u003ch2\u003eBest For\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLS builds already on a Holley Hi-Ram that have outgrown whatever injectors came with the manifold kit.\u003c\/li\u003e\n\u003cli\u003eCOPO-style drag and bracket cars, where run-to-run consistency beats a headline flow number.\u003c\/li\u003e\n\u003cli\u003eA step up in power adder, where the fuel side has to move before anything else can.\u003c\/li\u003e\n\u003cli\u003eTuners who would rather start from a known injector with data behind it than characterise an unbranded part on the rollers.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhy The Hi-Ram Intake Changes The Injector Choice\u003c\/h2\u003e\u003cp\u003eInjector flow and injector aim are separate problems. Fit a large generic injector designed around a factory-height manifold and the cone can land on the runner floor rather than the back of the valve, which shows up as lazy transient response, uneven cylinder-to-cylinder fuelling and a tune that never settles. Nostrum targets the spray for the Hi-Ram plenum height, so the flow increase is usable rather than something the calibration has to work around.\u003c\/p\u003e\u003ch2\u003eKey Specs\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eManufacturer: Nostrum High Performance\u003c\/li\u003e\n\u003cli\u003eProduct type: port fuel injectors (PFI), set of 8\u003c\/li\u003e\n\u003cli\u003eSKU: L071-1084\u003c\/li\u003e\n\u003cli\u003eFlow rate: 670cc\/min, equivalent to 63.8 lb\/hour\u003c\/li\u003e\n\u003cli\u003eIntake application: GM LS engines with a Holley Hi-Ram intake, including LS COPO builds\u003c\/li\u003e\n\u003cli\u003eFitment type: intake-specific spray targeting, not a universal injector\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFitment And Setup Checks\u003c\/h2\u003e\u003cp\u003eThese are chosen by intake and injector height rather than by chassis, so confirm you are on a Holley Hi-Ram manifold and check injector bore length, connector type and rail spacing on your own setup first. Plan the calibration at the same time and request the tuning data through Nostrum or your dealer so your tuner has the characterisation in hand. Running a different manifold? A differently targeted injector will suit it better - see the \u003ca href=\"\/collections\/port-fuel-injectors\"\u003eport fuel injector range\u003c\/a\u003e or the \u003ca href=\"\/products\/nostrum-nostrum-port-fuel-injectors-universal-ev14-standard-pencil-stream-uscar-connector-set-of-8-1300cc-l781-1948\"\u003euniversal EV14 set of eight\u003c\/a\u003e.\u003c\/p\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\u003ePort fuel injectors (PFI)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eL071-1084\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSet Size\u003c\/td\u003e\n\u003ctd\u003e8 injectors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlow Rate\u003c\/td\u003e\n\u003ctd\u003e670cc\/min (63.8 lb\/hour)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVehicle Application\u003c\/td\u003e\n\u003ctd\u003eGM LS engines with Holley Hi-Ram intake; LS COPO builds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpray Pattern\u003c\/td\u003e\n\u003ctd\u003eTargeted for the Hi-Ram intake\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning Support\u003c\/td\u003e\n\u003ctd\u003eData on request or through a Nostrum dealer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eWill these work on an LS with the standard manifold?\u003c\/h3\u003e\u003cp\u003eThey are aimed for the Hi-Ram, so on a factory-height intake the spray will not land the same way. Pick an injector targeted for the manifold you actually have.\u003c\/p\u003e\u003ch3\u003eDo I need a tune to run them?\u003c\/h3\u003e\u003cp\u003eYes. Moving from a stock-size LS injector to 670cc changes the fuelling maps completely. Ask Nostrum or your dealer for the injector data before the session so your tuner is not starting from scratch.\u003c\/p\u003e","vendor":"Nostrum High Performance","product_type":"Port Fuel Injectors","created_at":"2026-07-24T13:03:10+01:00","handle":"nostrum-nostrum-ls-copo-and-holley-hi-ram-pfi-injectors-l071-1084","updated_at":"2026-09-09T22:28:37+01:00","published_at":"2026-07-24T17:57:54+01:00","template_suffix":null,"published_scope":"global","tags":"brand:nostrum-high-performance, cat:fuel, dept:performance-parts, GM, make:gm, type:port-fuel-injectors","variants":[{"id":54805987656022,"product_id":11142675235158,"title":"Default Title","price":"932.15","sku":"L071-1084","position":1,"compare_at_price":"","fulfillment_service":"manual","inventory_management":null,"option1":"Default Title","option2":null,"option3":null,"created_at":"2026-07-24T13:03:10+01:00","updated_at":"2026-09-09T22:28:37+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":14231276880214,"product_id":11142675235158,"name":"Title","position":1,"values":["Default Title"]}],"images":[],"image":null}}