MrElectric03

iTrader: (71)

If you have the cash...I would say either Trick Flows or AFRs, also hearing good things about the new edelbrocks.

For bang for the buck I would go with the PRCs

odarabla

iTrader: (1)

Agreed. If you don't have the cash just save up until you do have the cash and buy good heads.

FireChicken02

iTrader: (4)

OK heres the setup...

346 LS1
Currently Have Dart heads... they have been great heads and make pretty good power considering my baby cam.
216/220 .525/.532 114 LSA
I have a underdrive pulley
Mac Headers
Fast 90mm
Nick Williams 90mm throttle body
85mm MAF
85mm Lid
Borla cat back

I dynoed 365 rwhp through my 4l60E.


NEW SET UP

I am swappin to a T56 with a moser 9 inch with a 4.10 in a few weeks and plan to go with a considerably larger cam...

I'm think 236/230 .6??/ 6.?? lift 112 LSA???
I plan to install a new set of American Racing headers
New cat back

I am considering ET performance, AFR, Trick Flow, and Edelbrock.

I know I want smaller runners (i think) and I realize flow is important, especially not just at the top .600+ Still I am unsure which are better performers and exactly why?

I hope to make 450+ rwhp

475 would tickle me sh*#less

99blancoSS

iTrader: (115)

Those numbers are attainable but that 9" is going to eat some power. I did a max effort 347 with Mamo massaged AFR's matched 90 NW TB and my heavy drivetrain and got to 439..LOL Same formula Patrick used to get to 500 but he had a better Y pipe and the stock rear and didnt have heavy aftermarket 18" wheels either. Cam was a 238/240 113 lsa +3 I think. All 4 of those heads would do it, the AFR would need to be touched up by Tony I would think. The TFS and Edelbrocks are available, the ET's dont seem to be right now.

I was talking to someone this moring and he was telling me about a set of Edel 245's on a 346 making 480 and not loosing anything down low," made beans everywhere" is the quote and the TFS have been proven by Vengeance to hit the 500 mark so you have a few choices. The nice thing wbout the Edels is they will take you stock rocker and valve covers where the TFS need an aftermarket set and spacers iirc?

vettenuts

iTrader: (4)

If you swap them, then AFR's. Like 99blancoSS, I have a set of Tony's massaged heads on my workbench right now that will replace my Dart 205's. Here's one other option, contact Bret Bauer who knows how to make the Darts really perform. This may be another option for you since you already have the heads.

99blancoSS

iTrader: (115)

^^^ good advice, honestly they are very good head already.

racing1g

Well...if your really on a budget and want flow as good if not better I would say....a pair of L92's, they are just as good as the AFR heads and can be had for cheap!

72ChevelleConv.LS1

iTrader: (5)

efdsghj

Wonderbread

iTrader: (51)

TEA should also be mentioned. They have a great line of heads. I personally went with the TFS 215cc's and am very happy.

LSWONGTO

iTrader: (3)

I am getting TFS 225 for my goat in a few weeks. But if I were you I would just have the darts you got ported and they would be just as good as AFR/TFS.

FireChicken02

iTrader: (4)

From what I have seen getting my heads hand ported will cost me more (with what i already have in them) than trick flows. How much will they cost? How many places are there? Do they CNC or Hand port? Any idea how well they perform? Also, I have heard of a lot of ported Dart heads smokin really bad (just ported ones)

Brian Tooley Racing

iTrader: (13)

The TFS heads do not need spacers, and any head (GM included) with bronze guides will suffer from premature guide wear if using stock rockers, this is why TFS calls for roller rockers.

SIC LSX

iTrader: (10)

thrickflow's or ETP

Mac 2002 SS

iTrader: (6)

Livernois Motorsports LS6 Stg II Heads gets my vote !!

vettenuts

iTrader: (4)

Couldn't agree more, but a lot of guys just bolt them in (stock or roller) and don't check the width of the wipe pattern either.

SOMbitch

iTrader: (8)

I know two guys running Brett Bauer ported Darts and they are awesome Gotta pay to play though. Getting yours ported would still be cheaper than a new set of TFS, AFR etc..

Jason 98 TA

iTrader: (4)

As most of you guys know we've been working really hard recently to rework all of our cylinder heads to improve power, performance, and value! The LS6 head is the newest cylinder head to go through these revisions. All future LS6 heads will ship with all the new features at NO EXTRA COST!!!


We just finished up the newest revision of the PRC LS6 cylinder head! The new cylinder head features a new smaller intake runner (225cc), new bigger cfm exhaust port, & aftermarket rocker arm clearances!!



The new intake port was reshaped to provide the same great airflow you've come to expect from PRC with a smaller runner for increased velocity & throttle response!

Here's a few pics of the new ls6 intake port. The port in this pic goes 310cfm @ .650 lift!!




The Exhaust Port was also completely revised from top to bottom! The all new exhaust port flows as much as 10cfm more air than the previous port with the same valve size!


NOTICE IN THIS PIC THE ALL NEW AFTERMARKET ROCKER CLEARANCES & CUSTOM PRC ENGRAVING!!


Improved airflow, improved features, smaller runners all available at the current special price of $949.99 with stock springs!!!!

88ls1blazer

iTrader: (1)

Aren't those 799 heads? NOT 243?

Jason 98 TA

iTrader: (4)

Yes we have both 799 & 243 castings in stock. I built the first set out of 799s just incase I killed one testing!! Everyonce in a while I'll screw up posting a file & kill a head. I killed a 5.3l a few weeks ago testing

I personally like the 799 castings, they clean up nicer than a 243 casting IMHO!

LS1C5Vette

iTrader: (11)

If I was to order these heads can I request 243 castings?