I have twin 454 efi mags with 385hp,I would like to get 500 to 550 hp out of them. I want to stay with efi.
Some idea's I have are: Raise compression from 8.5 to 10:1
Bigger cam/roller
Port heads
Aluminum heads
Dry sump system (worth aprox 30hp)

Is staying with the efi a bad idea,does it limit things.

Im guessing you would have to ditch the EFI, go with a bigger roller cam, some headwork, roller rockers, good intakes, and a 850 holley. 10.1 sounds high especially if you stay with iron heads.

Im sure the builders will help you more than I can. Maybe you could just supercharge them.

I thought you said dry sumps were worth 50 HP, I guess the voice of knowledge set you straight on that I think you should save your money for a tow vehicle, it's pretty hard to use that extra horsepower in your driveway! What a dreamer, get off the computer and get to work for a change. Have a nice weekend! Steve

The easiest way to see that HP is to go aspirated and do some port work to the heads and a cam change. With good port work and a nice cam it would not be hard to get as much as 650+hp. If you are interested in doing this let me know.
Thx Mike
Roccard Marine Engines
570-956-2840
[email protected]

An EFI supercharged (Procharger M1 SC, etc.)will put you where you want to HP wise and can be dependable on pump gas.
If you are considering further modifications a M3 SC would be a better option because of the larger intercooler (I havn't met to many people that get satisfied and don't consider additional modifications a year or so later).
As to EFI in with a modified supercharged motor I beleive that a well set up motor with the proper injectors, fuel system, and ECM re-map is an awsome set-up. It takes some homework as to the proper injectors, fuel system, ECM Re-map etc. Make sure you have a good tuner and builder that can work together, at the end of the day you need the combination of good parts and good smarts to keep it off the trailer.

A m3 kit from Pro Charger is a nice kit and if you only run 5psi of boost no remap is necessary. But make sure the bottom is strong before installing.

I have an M3 and intercoler for sale in the "class" section for $2900????

The voice of knowledge told me not to go with it ,he did not quote a hp,his engine builder well enough said.. You know with the motors out I will have to do some mods to the motors
With friends like you and brian why buy a truck.
Get back to work?I'am following your lead.