Every common Gen III and Gen IV injector in one table: LS1 through LS9, Vortec truck engines, GM and Bosch part numbers, flow at 58 psi, and the three details that decide interchangeability: body height, o-ring size, and EV1 versus Multec versus EV6 connectors. Compiled by the injector cleaning department at Boost Lab, Inc.
LS injectors interchange on three axes: flow, height, and connector. Passenger car LS1 injectors are tall EV1 connector units; early Vortec truck injectors are much shorter with Multec connectors; Gen IV LS3 style injectors are shorter still with USCAR EV6 connectors and a larger lower o-ring. Get the height wrong and the rail does not seat, get the connector wrong and you need adapters, get the o-ring wrong and you get a high pressure fuel leak.
GM rates these injectors at 58 psi, not the 43.5 psi standard most aftermarket injectors are quoted at. That difference is why the same Bosch injector can carry two different published numbers depending on who is quoting it. All figures in this table are at 58 psi so they compare directly.
The popular budget upgrades come straight from this table: LS3 and LS7 share the 42 lb injector, LS9 and LSA share the 52 lb unit, and the Gen IV flex fuel truck injectors are drop-in high flow options for the 4.8, 5.3, and 6.0 rails. All are high impedance, so any factory or aftermarket LS ECU drives them natively.
| Engine | Years / Application | Flow @ 58 psi | Connector | Impedance | OEM / Ref PN |
|---|---|---|---|---|---|
| LS1 | 1997-98 Corvette, F-body | 26.2 lb/hr | EV1 tall body | HIGH IMP | 12554271, 12533952 |
| LS1 | 1999-2000 | 27.3 lb/hr | EV1 tall body | HIGH IMP | 12555894 / Bosch 0280155890 |
| LS1 / LS6 | 2001-04 | 30 lb/hr | EV1 tall body | HIGH IMP | 12561462 / Bosch 0280155931 |
| LS2 | 2005-06 GTO, Corvette | 34 lb/hr | EV6 USCAR | HIGH IMP | 12569113 / Bosch 0280158049 |
| LS3 / LS7 / L99 / L76 | 2008+ Corvette, Camaro SS | 42 lb/hr | EV6 USCAR | HIGH IMP | 12576341 / Bosch 0280158051 |
| LS9 / LSA | ZR1, CTS-V, ZL1 | 52 lb/hr | EV6 USCAR | HIGH IMP | 12598646 / Bosch 0280158187 |
| Vortec Gen III and Gen IV truck engines below. Early truck injectors are short body Multec; 2007 and later move to EV6 USCAR. | |||||
| LR4 / LM7 4.8, 5.3 | 1999 | 21.8 lb/hr | Multec short body | HIGH IMP | 25317669, 25320287 |
| LQ4 6.0 / 4.8, 5.3 | 1999-2000 | 24.8 lb/hr | Multec short body | HIGH IMP | 25317670, 25320288, 25323974 |
| 4.8, 5.3, 6.0 trucks | 2001-07 | 25.2 lb/hr | Multec short body | HIGH IMP | 25317628 |
| L59 5.3 flex fuel | 2002-04, return style | 33 lb/hr @ 50 psi | Multec, taller body | HIGH IMP | 12580426 |
| L59 5.3 flex fuel | 2005-07, returnless | 36.6 lb/hr | Multec, taller body | HIGH IMP | 25326903 |
| LY6 / LY5 / LY2 | 2007-09 trucks | 30 lb/hr | EV6 USCAR | HIGH IMP | 12580681 / Delco 217-1621 |
| LMG / LMF / L20 | 2010-17 4.8, 5.3 | 36 lb/hr | EV6 USCAR | HIGH IMP | 12613411 |
| L96 / flex fuel trucks | 2010+, drop-in high flow | 44-50 lb/hr | EV6 USCAR | HIGH IMP | 12613412, 12609749 |
High mileage 5.3 Vortec sets with one or two units flowing well below the others, showing up as lean codes and a shaky idle. Cleaning and matching usually beats gambling on used replacements.
42 lb takeout sets are the default swap injector. We verify the actual flow of each unit and match the set of eight so the tune starts from known numbers.
Pre-LS Bosch EV1 injectors from TPI and LT1 cars respond extremely well to ultrasonic cleaning, and originals are getting scarce. Covered in prose here, verified on the bench individually.
Yes. Both use GM part number 12576341, a 42 lb/hr high impedance EV6 injector, which also appears on L99 and L76 engines. LS9 and LSA likewise share the 52 lb/hr 12598646 injector.
GM rates its injectors at 58 psi while most of the aftermarket quotes 43.5 psi. The same physical injector flows noticeably more at 58 psi, so always note the test pressure before comparing numbers or entering data into a tune.
Not directly. Truck injectors are much shorter than tall LS1 injectors even though the o-ring sizes match, so the rail will not clamp them at the correct height without hardware changes. Match injector height to the intake and rail combination first, then flow and connector.
At minimum the true static flow at a known pressure and consistent behavior across all eight injectors. Our ASNU bench report documents each injector's flow before and after service, which gives your tuner real numbers instead of catalog assumptions.
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