hey guys i know there is a lot of questions about heads and cam packages on here, i just wanted to know for myself what kind of setup i should go with personally. i bought a 02 ws6 m6 not to long ago has 28000 miles on it, mods so far are hooker long tubes no cats hooker cat back plugs wires and a tune, it put down 344 to the wheels i want to do heads and cam package and want to make it a street car, how do i get around 480 to the wheels not spending crazy amounts of money. i was reading somewhere on here about the 5.3 2.5 heads making around 490 if i was corect anything will help i just want to do it right the first time thanks guys

 

I am in the same damn boat as you my brother.

 

hahaha

 

480 on a 346 can be done but is not easy unless you have a FAT wallet.

Go search the dyno section and see what setups are making what. And just because one setup makes 450 does't mean you will. There are just too many other variables.....

My last piece of advice is get the BEST heads you can get. Hit the classifieds and you should be able to pick up an aftermarket casting for around the price of a new OEM ported casting..

 

+1 and a cam to go with the heads and a good tuner!! and all supporting mods aftermarket intake bigger injectors etc

 

sounds good guys thanks

 

heads trick flow 215cnc,prc 215.intake fast 102,cam custom EPS.a good tuner.

 

so stay away fro the 5.3 2.5s

 

too small for that power level.

 

I made 463hp 414tq on a 346ci. afr 205 heads,g5x3 cam,non ported 90 fast w/th-body,85mm mass,asp pulley,kook 1 3/4,off roads,b&b catback,12 bolt w/4.11's,m6 car. if it was that easy everyone would have 490hp on a 346ci.
You will need good heads as a base to get what you want. I do not like 5.3 heads at all. I like trick flow(i have them now) afr (had them) because i know they do the job. Another head i see alot and i have no clue if it's good or not are the prc heads. The prc heads could be popular just due to price and great claims of flow for all i know. might want to do a search on them. for me, i would never buy them over afr or trick flow to go on my car. Good luck with your build.

 

ok there a big difference between 205 and 215 for my setup?

 

Depending on you cash flow I would look into a 215 head from trick flow or search the prc. I would get the compression up to 11.2-11.5 on pump to get the most from it. port the fast,have a good exhaust,asp pulley and get a cam to match. The combo needs to work togeather and you will get 460-480hp on a m6 car.

 

if you have the cash AFR 225,with a EPS cam.whats the prize for 500 rwhp NA.

 

Of course don't hesitate in checking out some of the builders over yonder>>>...most of the guys already mentioned key players in the head game. I personally (and biased-ly) like Performance Inductions stuff (PI) but they are a little pricey. Get what you pay for....

Think you can get there, just depends on wallet size and what you're willing to give up on the street.

 

im going to def look into the prc heads and the trick flows and go with 215s

 

I don't have my car yet so I can't speak from personal experience, but I do have a buddy on here that put down the power numbers your looking for with the prc 5.3 2.5 heads on a stock bottom end LS1. That and a 120 shot and he ran 11.20 up here at bandimere at 6000 ft PA. Don't know what the DA was that day. There's a video of the run on the Bandimere website. It is possible to make the power your looking for on the 5.3 heads with all other supporting mods and a good tune.