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Old 10-31-2012, 01:46 PM
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Vortec 355 fuel injection question??

Hello,

I have a 5.7 350 vortec .30 over daily driver+occasional tow(less than 5 times a year)
with comp cams 08-300-8 (grind cs 262h-r12)
duration at .050 206(intake) and 210(exhaust)

Rebuilt the trans and just beefed it up a little.

I estimate I will be pushing between 325 hp and 350 hp.

Original mileage was 272,000

I am just finishing up the build and realized I did nothing with my fuel injection system. I "believe" I have a multi-port injection looks kind of like a spider legs.

Can I just clean this well and call it good?

Do I need to replace the whole system?

Are there any specific parts that you would recommend that I change or inspect?

Thanks for the input!

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Old 10-31-2012, 08:07 PM
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Quote:
Originally Posted by abbazabba View Post
Hello,

I have a 5.7 350 vortec .30 over daily driver+occasional tow(less than 5 times a year)
with comp cams 08-300-8 (grind cs 262h-r12)
duration at .050 206(intake) and 210(exhaust)

Rebuilt the trans and just beefed it up a little.

I estimate I will be pushing between 325 hp and 350 hp.

Original mileage was 272,000

I am just finishing up the build and realized I did nothing with my fuel injection system. I "believe" I have a multi-port injection looks kind of like a spider legs.

Can I just clean this well and call it good?

Do I need to replace the whole system?

Are there any specific parts that you would recommend that I change or inspect?

Thanks for the input!
If it was me, I'd plan on doing some work on the system.

It's called Central Sequential Multiport Fuel Injection and it has problems, including the poppet valves and lines.

Instead of trying to give you a complete rundown, suffice to say there's info out there for replacing the poppets w/a better, less failure/leak prone set up.

One such set up is: http://www.napaechlin.com/upload/NAP...K_VortecFI.pdf

At the very least, check/clean what you have. A tutorial like Poor Mans Repair Guide For Chevy,GMC Vortec Fuel Injector spider or CSFI System will give you an idea of what's required.

Good luck.

Last edited by cobalt327; 10-31-2012 at 08:14 PM.
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Old 10-31-2012, 08:16 PM
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God I hate that damn fueling system, it is a pain in the ***, when it works right its fine, but when its old and brittle and fiddled with it tends to leak somewhere.
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Old 11-01-2012, 09:35 AM
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Sounds like I am going to buy the conversion. For approximately $400.

Way more than I wanted to spend but might as well do it right the first time eh?

Just fyi.. I called my local chevy dealer.. $150 per injector to replace the old stuff!!!! Ridiculous

Thanks for the info guys.
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Old 11-01-2012, 11:12 AM
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Well gents I ordered the new part and wanted to pass along some info.
  1. Napa pn 2-38887 made by Napa Echlin $385
  2. Checker carries a Borg Warner $322
  3. Autozone has a Delphi $385
  4. GM dealer pn 19210687 runs $560 (delphi part)
  5. I found it online for $243 made by delphi pn FJ10566.. shipped free too!!

Hope this helps someone in the future.
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Old 11-01-2012, 11:41 AM
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Quote:
Originally Posted by abbazabba View Post
Hello,

I have a 5.7 350 vortec .30 over daily driver+occasional tow(less than 5 times a year)
with comp cams 08-300-8 (grind cs 262h-r12)
duration at .050 206(intake) and 210(exhaust)

Rebuilt the trans and just beefed it up a little.

I estimate I will be pushing between 325 hp and 350 hp.

Original mileage was 272,000

I am just finishing up the build and realized I did nothing with my fuel injection system. I "believe" I have a multi-port injection looks kind of like a spider legs.

Can I just clean this well and call it good?

Do I need to replace the whole system?

Are there any specific parts that you would recommend that I change or inspect?

Thanks for the input!
Just eliminate the problem >>> GM VORTEC CSFI to MPFI CONVERSION >>>.

Bogie
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Old 11-15-2012, 01:27 PM
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Thats CSFI to MPFI is a GM fix and was done under warranty to CSFI Voirtec 305 350 vehciles in California due to the Cali gas being incompatible with teh CSFIO kits.

Eliminate the spiders altogether.
GM Performance :: View topic - Vortec L31 MARINE MANIFOLD project! Q&A

peace
Hog
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