That's correct; Central Point Injection.

Should be about 80+ psi. But I don't think you can remove the vacuum for the FPR.

 

Ok i was just wondering...

So when im tryin to find out what jets to use what Fuel PSI do i need to use?

 

You'll probably pull the fuel from that schrader valve, so 80 psi is what I'd base it on for the fuel nozzle.

 

Yea i knew that, Ill have a LM1 hooked up to check the AFR..

I think i can do the COS and run it to pull timing when the arm switch is turned on... i think...

 

That's not quite correct. It's CSFI. Central Sequential Fuel Injection on the '96 and newer 4.3's.

 

I was thinking of the 92-95's for some reason; yes, it's sequential, not port.

It's a really shitty system if you are looking to make power. You have no ability to up your injector size and the fuel pressure is already through the roof.

 

Yes, I agree with it being a bad system for performance. Yet with a wet 75 shot on the 4.3, there isn't much to worry about.
Fortunately, some of us with the 4.3 S-10's have overcome the fueling issue so we have the potential to make some power.