I've read that the holley 670 tbi injectors (85pph) are rated at 12 psi, and I've also read that there rated at 22psi. Does anyone know for sure what psi holley rates there injectors. I did contact holley directly but, the tech guy didn't know.

 

I'm using the 85pph on my 383. The Holley tech told me they were rated at 21 psi. This is for the new syle injector of course, part #522-43.

 

The old style injectors I was using a few years back were rated at 15 psi. You should send an e-mail to the holley guys to make sure. It seems strange to me that they would change the pressure they rate them at...

 

They did change the pressure rating. The old syle injectors w/ the semi-sphere cap were crap. Holley doesn't even sell them anymore because of the problems they had. Holley uses delphi injectors now, which actually perform better at a higher pressure. The design is nice as well, as the diameter is much smaller, thus making the dia. of the pods much smaller which ultimately means less restriction in air flow. The only down side is if you have the old style pod and need new injectors, you're gonna have to shell out $70 for the new style pod and then another $75 a pop for the injectors.
I'm actually in the process of swapping in my 383, and just got my 85pph injectors a couple of weeks ago. I was on the phone with the Holley tech a few times, and that is how I KNOW they are rated at 21psi. But you can always e-mail them for piece of mind I guess.

 

Did he happen to say what the injectors could handle for psi? It would be nice to get theose things to flow around 105pph

 

No, unfortuantly not, though I did not ask when I talked to them. If I get a chance, I will call them today for my own knowledge as well. Though I don't think my regulator will go past 18psi. I think I'll end up going Jon's route and adding a vacuum to the afpr. I hear ya, 105pph would be sweet.