Been searching for the past 2 weeks and have not really found any info on this so I figured I post up this thread.
I am starting to gather parts for my summer build. My goal for the car is to hopefully make 500+whp all motor and 650+ on the nitrous, through the stock bottom end ls6, and mostly stock drive train.

The combo that I have in mind currently.
A 230+ lift .60+ duration cam with around 112 lsa
high compression heads either AFR or trickflow, or maybe PRC, get the compression to high 11s maybe 12 on pump gas.
Car will also have a double roller timing chain, and high flow oil pump.
It will more than likely have a fast 102 with a 102mm throttle body, unless I can't get the darn thing to fit.
The intake and heads will be port matched locally here in Houston.
The car will more than likely have an e85 tune as well.

I would like to have nice running all motor car, but my main concern is how good it runs on nitrous, so the build will be more focused toward the nitrous aspect.

As for the nitrous,

Its almost definately going to be a stand alone direct port setup, with a 150shot.



Now for the questions I have.

How reliable is this setup going to be? I realize it is a ticking timebomb, but I will be starting the build on my next shortblock right after so I require it to last about 6 months-1 year, Is that realistic? How hard will the high compression and nitrous be on the stock ls6? the car is mostly a garage queen, driven probably about 5-6 times a month.

Are my number expectations realistic or not?

Also my biggest question, what heads should I be using? Since its is going to be a nitrous car, should I be looking at bigger heads like 220-230cc, or should I look more toward 205-210cc which is a good combo for n/a 346. Also can anything be done to the heads to make it safer for nitrous? for example aftermarket head gaskets?


Sorry for the long rant, hopefully I have provided adequate info, just looking for some feedback, answer to some questions. thanks.

 

You most likely will not make 500 rwhp NA with 346ci. It has been done, but it is very hard to get there. 600-625 on spray would be a more realistic goal. As for the setup, it looks pretty good. Any setup that makes good power NA should make good power with a 150 shot. With that small of a shot, a nitrous cam is not necessary. A good 225 head with 1-7/8 headers will probably be required to meet these goals. Don't forget about the fuel system either.

 

http://www.youtube.com/watch?v=9TskHUz444k
Here is the current setup, also good to mention the car has a bit more than 20k miles, all work on the car has been done by myself personally.

 

Without a doubt the head I would look at is the PRC 227 heads. We offer them with a small chamber for big compression while keeping good p/v clearance.

The 227 PRC head is without a doubt the ultimate 3.9" bore cylinder head available. It features the highest flowing intake port available for a 3.9" bore & a big flowing exhaust port that will really shine under nitrous!! We can put together you a complete package with 227 PRC heads & a camshaft that will meet your goals.

http://www.texas-speed.com/p-1163-pr...der-heads.aspx

 

I have heard of good things about the prc heads, the most attractive part definately seems to be the price and the springs that don't cost extra. What rockets would u recommend with these heads? The engine will probably see slightly above 7k rpms also what springs would u recommend for 7100-7200 redline on stock bottom end.
Also can u pm me a price for port matching heads and the manifold if u guys offer that speed?

 

bump, who's got the answers?

 

AI ported 243's, 92 FAST port matched to heads, and trex