C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Sep 13, 2005 | 11:57 PM
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Does anyone know if injectors from an LS1 motor will work in a L98? I just bought a set of 26# injectors off ebay for $52.00. The seller said they had less then 4000 on them. I want to put them in my 383 that I am building. I know the retainer clips won't work but doesn't the fuel rail actually hold them in? They are part #12555894. FiveO Motorsports say they are 26lbs/hr-4 bar injectors for 1999-2001 Corvette LS1.

Here is what they look like according to the picture on FiveO's webpage

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Old Sep 13, 2005 | 11:59 PM
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I have read many post's suggesting that they work very well.
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Old Sep 14, 2005 | 02:12 AM
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They will work fine but you may want to machine down the fuel rail mounting bosses on the intake...about .070-.080" should do it. The LS1 injectors are a hair shorter than the stock TPI injectors.
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Old Sep 14, 2005 | 10:54 AM
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They work fine, when installed in a L98 with 43.5 PSI (3 bar) rail pressure the injectors flow about 24lb/hr. I just tuned a fellow forum members car last week with the same injectors installed in a 383.
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Old Sep 14, 2005 | 02:07 PM
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I ran them in my lightly modded L98 but had to pull them due to rich condition that I could not correct via the AFPR.

I cut a clip ring groove around the injector body about 1/8"-1/4" above their stock groove; this allowed them to seat deep enough into the intake base and seal well at both the fuel rail and the intake base.
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Old Sep 14, 2005 | 02:34 PM
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It would seem to me that 24# would be too low for a 383 especially if it has much of a cam, reprogrammed ecm, intake, exhust etc Seems like it would cause a lean condition if pushed hard like test and tune etc
There is a formula somewhere for determining injector size I remember seeing it but dont know where
There are many people on this forum who know a lot more about this than I do
Just my .02
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Old Sep 14, 2005 | 11:22 PM
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Originally Posted by tjwong
They work fine, when installed in a L98 with 43.5 PSI (3 bar) rail pressure the injectors flow about 24lb/hr. I just tuned a fellow forum members car last week with the same injectors installed in a 383.
I am planning on putting them in my 383. I have an AFPR on this car. Where should I set the fuel pressure at?
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Old Sep 14, 2005 | 11:52 PM
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Becareful.. there are atleast 3 different LS1 injectors with different ratings in just the F-body's alone. They range from 25-28 #/hr.
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Old Sep 15, 2005 | 02:23 AM
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Originally Posted by Alvin
Becareful.. there are atleast 3 different LS1 injectors with different ratings in just the F-body's alone. They range from 25-28 #/hr.
These came out of a WS6 T/A. The part number on them say they are the 26# variety.
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