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Originally Posted by dctrumpet View Post
I know this is 2 years old, but I just came across this post and thought I'd add to it for future reference.
25170301 injectors are marine injectors and can't be found anymore. I have pulled apart about 6 of these TBI units with these exact injectors in them. I sent them off to be cleaned and flow-tested and they are ~760cc/min @ 14.7psi. This is the exact same flow rate as the 5235206 5.7L TBI injectors when tested at 14.7psi.
Hope this helps.
I found that out as well. Its just that they are the true high pressure design like the high pressure 4.3 sized injectors in the 94-95 TBI 454 trucks. The 25170301s ran with a 28-32 PSI regulator and flowed substantially more than the ~760cc/min when running at 32 psi.
I found this here:
http://www.thirdgen.org/techboard/tbi/440841-big-tbi-injectors.html Its sounds like your on the right track
Also if his injectors aren't electrically damaged could they be sent out to be cleaned?
Some other stuff:
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I have found that the typical "90lb" 5235231 injectors don't do well above 30+ psi. The higher the pressure above that the more they "shut" down or lose their flow. "80lb" 17084304 injectors do much better and have a nice linear increase in pressure up to about 40psi then they lose as well.
The 17084304 can be found here under a 1993 Chevy 2500
http://www.shopinjectors.com/fuel-injectors/tb124.htm This place has a help line, maybe he could send his in and have them rebuilt.
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