I have a 2003 5.7 hemi with 3000 miles on it and i plan to use it in a muscle car project, 3200 lbs, 6 speed transmission.so i am only interested in carbrated hemi info, i hear how well the EFI is but i really want to stay with the carb, i know absolutly nothing about computers and efi, that and a carb just looks right in an old car.i am hopeing to make over 500 HP with it . it will be mostly street driven with the ocasional trip to the track on street nite.

i was think of using the xv intake and MSD 6hemi ignition box. the only cams i know of are the comp cams, are the other /better ones?
what about uping the compression? how high is safe in this hemi on pump gas? and how much of an improvement will it make?
how about heads? will porting make a major improvement? who is good with them?

stroking? i was trying to stay away from that to keep the price down but it is possibly an option.

i remember reading in i think hot rod a while back they made 480 HP with a cam swap , headers and computer work, and i think 520 HP with ported heads , does this sound right?

everything seems to get expensive fast when it says hemi so i am trying to keep cost under control. heck if it gets to bad i will just sell it and build the 440 up. seen pistons for $900 for the hemi! is this normal?
any other good advice on improvements and parts to get?

talk to alexp and gremlinsteve. they seem to be on the up and up...

the price you might have in an XV intake and the wiring from MSD, you might be able to keep EFI.

I understand the keep it simple approach with the carb

this should be a good read...

justin

Quote:

---

5.7 hemi, what can be done to make more power?

---

replace with a 426 Hemi

I think procharger has a setup for these already, thats the way I would go, boost it.

A stock 5.7 Gen III Hemi comes with 9.6:1 compression. The top ring lands are only 3mm down from the top of the piston and I've seen the ring gap as tight as .090". Thats the bad news with these new Hemi's. These heads beg for porting! The stock heads that we tested flowed 268 cfm at .600" lift and with a simple pocket port we easily seen 300 cfm. The valve train is only good for .585" lift, but with a good port job I've seen 348 cfm at .700" lift and 368 cfm with a ported 6.1 head. I've run both the XV and Mopar Performace intakes and the XV has a slight edge over the MP, but the XV has been hard to get lately. I'm currently running the MP intake, but I had Tom Waters make me some 1/2" spacers that fit beween the intake and head to gain a bit longer runner length for low end torque. So far it's working great. I've only ran FI to date, but we're planning on building a 12.1 carbed engine in the near future. The Gen III Hemi ignition uses a crank and cam sensor. If you plan on going with FI, you'll need to purchase the MP PCM and wiring harness. That cost alone is around $2600 plus a laptop for tuning. These little small block Hemi's can make some big power and the block is stonger than I ever expected. The complete engine weighs in at around 400 lbs. If you have any other questions, let me know. I'm more than glad to help you out. We've been building these new Hemi's since 05 and making some big numbers with them. Gremlinsteve and I are usually on the phone a few times a month updating one another on new findings. In fact I just sent him a chunk from the new 09 closed chambered head for him to take a peak at.

i got this motor in may of 04 and set it up in my car but then got so irritated trying to find stuff to make it run that i finally pulled it back out and put the 360 back in. there was nothing aftermarket then to get and every one was working on something but never seemed to have it. i actually got the first 130 tooth flywheel from mcleod for it then.

now its different and there is parts out there if you want to spend the cash. so i am saving up to build it up some and put it in the daytona .

i am thinking a new comp cam, msd 6 hemi ignition, XV intake, 750 holley,ported heads, custom headers.and i am hoping to get some good power from it. if i got the cash i was thinking higher compression pistons also may be 10.5-1.

should this get it close to or over 500 HP? i am no professional engine builder, just your basic smallblock overhaul stuff so far. and i have never messed with a hemi so any advice would be great.