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OEM Fuel Injector Differences

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Old Aug 16, 2018 | 10:10 PM
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Default OEM Fuel Injector Differences
What is the difference between the LS1 (#12554271) and LS6 (#12561462) fuel injectors?
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Old Aug 17, 2018 | 01:11 AM
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Originally Posted by Chris Draper
What is the difference between the LS1 (#12554271) and LS6 (#12561462) fuel injectors?
those are identical but the 99-00 spec specs are slightly different.
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Old Aug 17, 2018 | 09:28 AM
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Ls1 26# LS6 28# flow
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Old Aug 17, 2018 | 12:33 PM
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Originally Posted by feeder82
Ls1 26# LS6 28# flow
100% Both injectors are identical fit and wire harness connector wise.

NOTE! ANY TIME you change injectors on an LS engine, you MUST go into the PCM and change (TUNE) the injector flow rate tables for the engine to function properly. You would need, LS- Edit EFI Live or HP-Tuners ect.. to do that.

Bill

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Old Aug 20, 2018 | 01:26 AM
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1997-98 ls1 part number 12554271 , 24.7 @ 3 bar & 28.5 @ 4 bar
1999-00 ls1 part number 12555894 , 22.3 @ 3 bar & 26.3 @ 4 bar
2001-03 ls1/6 part number 12561462 , 24.7 @ 3 bar & 28.5 @ 4 bar
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Old Aug 20, 2018 | 07:29 AM
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My guess would be they just reissued a new part number when they went back to them in 2001.
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Old Mar 31, 2021 | 02:19 PM
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Default Injector Specs
Originally Posted by Chris Draper
1997-98 ls1 part number 12554271 , 24.7 @ 3 bar & 28.5 @ 4 bar
1999-00 ls1 part number 12555894 , 22.3 @ 3 bar & 26.3 @ 4 bar
2001-03 ls1/6 part number 12561462 , 24.7 @ 3 bar & 28.5 @ 4 bar
Thanks Fellas Iv'e been looking for this information to input into new Holley Terminator PCM, I just installed. Will update ya'll how it went. By the Way Chris, i like your youtube channel! your a cool Cat!
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Old Oct 8, 2022 | 08:03 PM
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Originally Posted by CorvetteSF
Thanks Fellas Iv'e been looking for this information to input into new Holley Terminator PCM, I just installed. Will update ya'll how it went. By the Way Chris, i like your youtube channel! your a cool Cat!

You ever set these up in the terminator? How did it go?

I have an LS6 manifold I put on my LQ4 trans am swap, I'd love to see how you set them up
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