Ls1LikeNoOther

So im underway on my 408 build now(got the block crank and rods) havent ordered pistons yet due to the fact I dont know yet what cylinder heads im getting.
I was sold on AFR because of the nice flow numbers and the quality of the CNC work and the price isnt horrible. But maybe I was just sold on the name?
I checked out ET performance just now and it looks like they have some KILLER heads. their 225 flows 8 cfm more than the AFR plus they go all the way to 255! I dont think i need that much cylinder head yet but its there at least.

I am going for around 11.5:1 cam I am uncertain but it looks like guys are having good results with cams in the mid .600 lift area with high 230 low 240 duration on a smaller(108) lobe from what i can see. Comps biggest cam the off the shelver is around there, but maybe ill have one ground.
fast 90/90 on top aeromotive fuel system, kooks headers. Im going 4l85e from FLT with a Coan precision built converter.
My goal is around 550 or more RWHP, im gunna need it because I got a full weight hawk with a 6pt and I dont wanna gut this thing its too nice.

this is street and strip. But now I ask you guys, which cylinder head do you recommend? They both seem to have bad *** heads, are their other manufacturers or CNC companies out there making better ones?
Thanks for the help guys.

Brian Tooley Racing

iTrader: (13)

I think your going to need more duration then you spec'd out to make 550 RWHP through an auto. I am working with a customer to make 575 RWHP with TFS 225 heads, 408 and a M6, so if you have time to wait on those results then we might all learn something. There are a couple of results in the dyno section of the TFS 225 heads making 550 RWHP, you might do a search of those.

headed-ws6

iTrader: (34)

I would check out the trick flow heads the was an article about them in gm high tech and they out flowed all the competiers and made more hp

YellowToy/A

iTrader: (1)

TFS or AFR. With TFS u will need roller rockers but they seem to make big HP. Mid .600 is alot of lift. Make sure ur valve train is up to it. I friend broke alot of things before he got it right.

Ls1LikeNoOther

thanks guys for the input so far ill check out those heads...The rockers will PROBABLY be Harland sharp's. It will have all the good valvtrain stuff in it to handle the lift, my duration numbers might be low, but like I was saying I didnt know an exact yet due to cylinder head choice...But this might lead me in the right direction, Keep em coming guys thanks.

Ls1LikeNoOther

Where do I find info on the TFS 225 heads?

slow trap

iTrader: (22)

sponsor t.e.a >
brian tooley who posted above in the man to talk to.

Randy WS6

iTrader: (69)

Texas Speed has some bad *** cnc heads, That were i got mine from for my LS2 418cid. 255cc runners

Gunnar@Patriot

iTrader: (20)

We have alot of customers who use our 243 stage III heads on 408's and do quite well. Give us a call and we will be glad to over options for your set of custom heads.

Greg Good

I would put an ET 245 cc head on it.

iflubyu

ETP canted valve heads = checkmate

HEMIETR

iTrader: (2)

TFS heads are making sick HP.

Ls1LikeNoOther

I was thinking with too big of a head id have to spin the motor real hard to keep the chambers filled? Or run tons of compression?

And I dont want canted valve heads, although it would be bad ***...

And right Now im looking into the TEA Ported 225 tfs heads, they will be getting a call tomorow.
As well as Patriot and Et Performance. I want the best head for my motor Im checking all sources.

Greg Good

An ET 245 would not be too large a runner for your application based on what I've witnessed.

speedracer5532

iTrader: (8)

I would give Tony Mamo @ AFR a call and talk to him about the AFR 225 head.

aequitas

iTrader: (2)

I dont want to thread hijack but I am building a 408 as well and after reading this thread went to several of the vendors mentioned websites. I noticed a TFS 240 on the TEA site that said they come out in fall of 06, however I was unable to find any info on the TFS website. Does anyone know if these heads are out or are coming out soon? If so, they might be a good option for a 408.

Brian Tooley Racing

iTrader: (13)

This may help, both are auto cars, TFS 225 heads out of the box

https://ls1tech.com/forums/dynamometer-results-comparisons/677365-updated-results-our-416-trickflow-stroker.html

Re-ported ET 245’s

https://ls1tech.com/forums/dynamometer-results-comparisons/662627-408-et-245-s-dyno-graph.html


There is far more to making power with heads than flow numbers on a flow bench

The 240's are going to be a 4.125" bore head, I don't know how they will respond to overhanging a 4.0" bore, but that situation is usually not desirable.

I just had a customer with a C6 Vette LS2 stock shortblock go from a LPE LS6 Stg 3 head with 11.5:1 compression to the TFS 225 with 12:1 compression. With the new TFS heads the MAF readings showed less airflow through the engine, the engine had no detonation, where it did before with the LS6 heads, and made 27 more RWHP for a total of 507 RWHP...did I mention there is far more to heads than flow numbers on a flow bench?

miami993c297

iTrader: (6)

ETP 215 here on a "small" 346ci stock block:

511 rwhp plus 455 rwtq.

Total drivability...

Great power down low!!!

I rev the engine to 7300 rpm + when needed, but power is there already at 3000 rpm...

On a practical side, the 11 degree valve angle gives you an amazing amount of PtV clereance.
You can use a HUGE cam without flycutting!!!

The insert in the heads are a technical plus...

Just facts that I report, good luck with your choice and have good power

Christian

brad8266

iTrader: (23)

DAMN!!! What size cam you running in there. Impressive numbers from a 346.

aequitas

iTrader: (2)

The 240's are going to be a 4.125" bore head

Thank ya much Mr. Tooley, I was unaware they were going to be that big.