What injectors are stock in a 01 454 Mag? With a procharger/aeromotive set-up @ 6 lbs boost, what would be a good injector choice?

I believe the stock injectors are 42lbs. They are only good till about 5 psi boost, without ridiculous fuel pressure, approaching the max of the injector (75-80 psi)
You should go to 50 lb injectors. Depending on the fuel rail you have, you may have to modify it to accept different injectors. If you have the Keihin injectors, there are no replacements that are larger. If you have the shorties (which I believe you should) then there are some larger ones available.(I believe I have some)
However, there are a few other things you must do if you want it to make that kind of power, be reliable, and stay together.
1) The fuel rail needs some mods. There is an injector hole that needs to be bored out. One of the injector feed holes is very small and will not supply enough fuel to that hole.
2) the fuel plumbing needs to be rearranged. You need to feed the fuel rail from both ends so one end does not run dry. Depending on which rail you have (there were 3 diff. ones) it may need some holes drilled and tapped for pipe thread.
3) You need a larger fuel filter, hoses, and fuel pickup in the tank (more than likely). Also get rid of the anti-siphon valve if it has one.
4)Get rid of the stock fuel pump and cool fuel and return the fuel to the tank instead of the filter head.
5) Lose the Procharger rising rate regulator (3:1 , 5:1, etc.) and get an Aeromotive 1:1 boost reference regulator.
6) Program the ecm on the dyno by someone that is not only familiar with Mefi ecms, but also Prochargers. They are very different than other boosted engines.
7) Change the exhaust valves. The stock exhaust valves are 2 pieces. They have an Inconel head and a SS stem. They do have a tendency to fail in this area.
8) Change the head gaskets to a set of Cometics. The stock graphite gaskets flat out suck.
9) Get a larger oil cooler and remove the oil bypass valve under the stock oil filter adapter. It allows hot, dirty, unfiltered oil to flow through the engine. You will be constantly fighting high oil temps without it.
I know if sounds like a lot. If you do the above items, then you will have a great running piece that will make some great power. It will be night and day from where it is now. None of the above is really that big of a deal.
I have done countless Prochargers and this is what it takes to make them work and work right. All of the above is true for any boosted setup on a 454/502 Mag engine whether it's a Procharger, Vortech, etc. except an Whipple, since they eliminate the stock fuel system. However, the rest of the fuel system, oil cooler, head gaskets and valves should still be done.
I would be glad to help with any of the above. I have had a ton of guys that sent their fuel rails to me for mods. We can also do the fuel rail and intake mods to make it accept different injectors if yours need it. I would be glad to put you in touch with some of them as references.
Here is a thread from about 6 months ago on a Procharger install with the above mods.
http://www.offshoreonly.com/forums/g...rformance.html

Feel free to contact me anytime if I can help in any way or if you just have some questions. I would be glad to help, even if it is just answering questions, so that you can have a successful install. Good luck.
Eddie

RC Injection in Torrance, CA has higher flow Keihin injectors.

What Eddie says is true except I have found the newer cool fuel mefi engines don't have the restricted injector rail, my 2000 didn't. I ended up making twin rails and really re-plumbing the fuel system as I upgraded mine even further later on though anyways. The Procharger regulators just never really work right, I found a Aeromotive set to hold the base pressure with a second rising rate regulator like the bell industries stacked inline to raise fuel under boost works flawless. Tyle Crockett started doing his that way too after I set mine up that way and he now stocks the rising rate regulator, Smitty

I buy my injectors from Ballengermotorsports.com They seem to be about as cheap as you can get.
I used these (http://www.bmotorsports.com/shop/pro...roducts_id/449) on my 454's with side-mount Whipples @ 9#s of boost.....on the stock fuel rail, deadheading fuel back to the stock fuel filter and housing with the stock fuel feed lines from the tank to the housing and SX fuel pumps and regulators. We did re-plumb the fuel system and deleted the cool-fuel setup.
I do agree that the Procharger fuel system is an absolute piece of garbage.

You are right Smitty. I think it started in 99 with the latest version of fuel rail. They have 1/4" NPT ports at either end and the supply line comes in the center on the port side. Those are MUCH easier to mess with. I will split the fuel line from the pump into 2 lines and feed the rail from each end. That way there is no chance of sucking one end of the rail dry. I then use the stock supply hose and run it to the Aeromotive regulator as a return. From there it goes to the tank.
That rail also doesn't need to be redrilled to accept larger injectors like the rails that use Keihin injectors. It uses a standard shorty injector. That rail makes life much easier. The earlier ones take me several hours to modify. However, I have made almost 1000 hp with them.
Eddie

Great input Eddie. Going threw my boat now that came with a Procharger and its still equipped with the standard Red procharger type regulator and seeing pressure jump between 50 and 75 at idle.

Plan to re-do the whole supply system - larger supply lines, add a better regulator & filter, run return to tank, etc.

I would like to continue to run the boat, however all i have available are 1:1 regulators. As you stated the red Procharger regulators are more 3:1 or such correct? That would keep me from being able to run safely until a tune is done.

That's correct. If you get rid of the rising rate regulator that comes with the Procharger and go to a 1:1 regulator, then you will need some reprogramming. Procharger used that regulator so they wouldn't have to do any programming. It's simply a bandaid......an inconsistent bandaid at that. On the earlier 454/502 Mags, they had to use the rising rate regulator because of the Mefi 1 ecm. The 1's have no provision to tune in boost. Raising the pressure is the only way to compensate for the extra air. With the later engines with Mefi 3's, you can simply retune them and use the 1:1 regulator. Let me know if I can help in any way.
Eddie