Nominal flow vs high flow injectors

[11bravoZ71]

Been searching for hours and weeks  and cannot find an answer on this topic. I have my l84 5.3 2019 Silverado. And need a new injector. So I’m doing all 8 might as well. At 100k miles.

 

My question is and hopefully answers this to others is. The stock injectors that came out of my are  PN: 12681212

Ok but 

when I research what new injectors for replacement I get 3 part numbers all being “compatible”. But one of those says “high flow”  etcc

research indicates I need 

PN: 12720120 high flow. 
or

PN: updated number to my originals

12710481 “nominal flow”
 

my factory installed ones are

 PN: 12681212 “nominal flow”

 

What’s more confusing is my original injectors are ALSO compatible to a l83 engine. So are these injectors all compatible? from 2014 and up. But the high flows are not compatible to the l83 leading me  to believe. The high flows are the correct ones for me . Even though my factory ones are nominal. 
 

just want to order the correct ones, truck is stock Does it matter I install high flow ones?

 

attached is my VIN search showing my results 

saying I can install either nominal or high flow ones 

why Does GM DO THIS. 

Edited February 8, 2025 by 11bravoZ71

[Jay P]

Have you tried going to a GM dealer parts site (like https://www.gmpartsdirect.com/) and look for the injectors by VIN? I would think that would give you the correct part number.

I'm not sure but the high flow injectors may be for a truck that can use E85/flex fuel and the normal are for non-flex fuel.

Otherwise I'm sure one of the GM techs on here will chime in with some help.

[11bravoZ71]

Thanks for the reply, and yes I’ve searched it specifically with my VIN. The attached picture shows my results. 3 different injectors all being compatible for the l84 , although they have different flow rates.  Other GM websites show same results. I’ve called the local dealers part center and they say 

PN: 12710481 Is the correct one. “Nominal flow” aka normal flow. 
Its the current updated part  number to my originals. So I ended up  ordering all 8 of them, and the fuel pump while I’m already in there. 

 

What throws me off is the fact that this part number is also compatible to the l83 previous gen v8. But have read that 2021 5.3 l84 have the high flows part number. But will update once I install them etc. in case anybody else has any confusion in the future. 

Edited February 9, 2025 by 11bravoZ71