[CaddyGirl]

Hey guys & girls, I need the part number for the LT4 HPFP and injectors. Need the items quickly to get our Camaro going.

[arpad_m]

CaddyGirl. I only have the LT4 injector part number, it's 12703611.

EDIT: the HPFP part number seems to be 12694529.

[CaddyGirl]

Originally Posted by arpad_m

CaddyGirl. I only have the LT4 injector part number, it's 12703611.

EDIT: the HPFP part number seems to be 12694529.

Thanks very much indeed!

[ZO6Ted]

There are a few part #'s just depends on what is still available. Long as they are LT4 I haven't heard of a difference in high flow and nominal flow injectors. Long as you use the same # on all is the information I've seen when researched. Got my inj. for $560 2-3 weeks ago. Don't need the hpfp in my case.

[ParisTNDude]

Originally Posted by ZO6Ted

There are a few part #'s just depends on what is still available. Long as they are LT4 I haven't heard of a difference in high flow and nominal flow injectors. Long as you use the same # on all is the information I've seen when researched. Got my inj. for $560 2-3 weeks ago. Don't need the hpfp in my case.

Thanks, very much. We settled on high flow injectors from ADM performance. Said to be matched set for $675...a lot of money, but we were tired of messing with all the different part numbers and ADM are experts with all of that. Now, with the high flow LT4 fuel pump and these injectors, we're going to be ok. Thanks for your input.

[EDFHOBBIES]

Yes there are a lot of numbers for the Lt4 injectors.. apparently there are 3 types Nominal, low, and high flow for LT1 and Lt4 models GM did this to get the rail pressure right for each car.. However now through in a few years of resourcing injectors from other manufactures and updates so the original part number of each flow has changed 3 or 4x hence about 20 different part numbers lol

GM LT4 injectors... current #: 12703611 (nominal Flow), 12703612(high flow), 12703613(low flow) may even have to use these numbers to even a new superseded number but some parts giants do have these still in stock for 62.00 Flow only matters if your replacing 1 injector, if you replace all 8 you can get Nominal, low, and high just make sure there the same.

Superseded LT4 injector numbers 12668397, 12650284, 12672374, 12684130, 12683517 does not matter which number you use as long as you get all the same in the set.



The pump is at ROCKAUTO under AC DELCO HPM1036 $644.00
or at GM online parts warehouses under number #12694529 $ 737.00
Both pumps are identical try either number at your favorite retailer one maybe cheaper than the other.

Call summit and they will match 644.00 plus 8 buck shipped. or they have the GM 12694529 for $697.00 and the injectors to.

I just did mine I had given my wife my LT4 injectors with 16k miles for her SS and took her's (LT1s) 56k miles so she could run more boost. Lt1 injectors didn't matter in my build because I use port injection as well. Car ran fine for 6 mos. then had to get them cleaned for 200 something. 3 weeks later one died all together so I said screw it I'm doing a new pump and injectors! Tuner wanted me to go back with LT1 stuff so he didn't have to retune i get it, but I'm not dishing out the same money for a LT1 injector when i could get the the LT4 same price.

I know you got your stuff but this should help..

Medicine bottle is my tool to see where the pump is on the lowest part of the lobe so not to damage the new pump.. with the injectors out and in neutral you can turn the balancer by hand so do this before installing pump and injectors.