A local f-body guy is selling brand new 42# injectors for $300. Is this a good price? What do I need to do to make these work on a 422 powered truck? I'm probably getting ahead of myself but, I'd like to get everything I need a little at a time so I don't hurt my wallet as much. Another question, would they be able to support, let's say, a 200 shot?

 

Maybe.

I ran Bosch 39.5 injectors with my old 422ci and I would not have had any room for spraying dry nitrous but I could have sprayed wet with a big enough intank...

 

BigTex or Parish8 can answer what it takes to make those work in your truck. They are not a direct bolt-in.

If you spray a 200 dry shot they will probably not be enough injector so you might want to go with a wet shot. That way the fuel solenoid with the nitrous system will supply the extra fuel needed.

If you go with a wet nitrous setup then you could use the injectors that www.rceng.com sells for our trucks. They are a direct swap and should support a 422 motor NA. RCENG's part number for these injectors is SDM-370. They are Lucas injectors.

John

 

They are bosch green tops, if that helps. Thanks for the replies thus far.

 

I thought you weren't going to move on to nitrous?

Those 42 # injectors are rated at 42 psi at 3bar, but at out fuel pressure of 58 psi (4bar), they will flow 49 psi.

Basically, the larger injectors can be made to fit physically (look up some my my posts over the last year). Tuning will be more of an issue. You will need LS1 edit so you can continually make small adjustments. You will also want to upgrade your in-tank fuel pump. In-line pumps are easier, but are somewhat hindered by the stock pump.

 

I'm still debating on it. "We" just hired a new guy at the shop about three weeks ago and he's been telling me about his big block chevy w/ nitrous. I must admit his stories are tempting me to maybe go down this path. I don't know much about nos, but I wouldn't mind learning.

 

what physically has to be done to make them fit? i have a set of the ford 30# injectors that will fit the LS1s but i heard you have to do some modifications to make them work on the truck rail. what's the word. and are the ford 30#(36# LS1) enough injector for a 370 ci heads cam motor with say a 300 shot? and what intank pump will work with the truck tank etc. i remember richard posting pics of the truck and f body pumps and they were different, what intank pump should we use on the trucks?

 

A wet kit will require that you run a stronger intank pump. Frankly with a 422ci engine you will need a better intank pump anyway. With a big enough pump you can run 150-200 wet nitrous no problem.

Now if you ran like a 49 (our fuel pressure) lb injector, you could probably spray about 150 dry but for sure you could spray 100 shot dry. You would still not have enough injector capacity for a 200 dry shot. The injectors will responsible for adding the extra fuel you need for a dry setup. If you run the injectors on the edge you can end up running too lean since you won't really have any room for error.