X-ZZ4

Title pretty much says it all......I'm wondering how much power the stock LS6 "243" heads are capable of supporting......and what other mods (ie which cam) is getting you there?

What about "mildly modded" 243 heads? And anybody responding to "mildy modded"....what exactly are those mods?

I'm thinking about getting a set of these heads......and my goal is 425rwhp on top of an LS1 block.....just wondering if the 243's are up to the job "stock" or almost stock or if I'd need to modify them somewhat drastically......if that's the case I might just go with AFR's instead.

JZ'sTA

iTrader: (23)

Why waste your money on stock ls6 heads?
You will still need springs to support the cam, and your compression isn't the best IMO.
You would be better off with a stage 1.5 5.3 tea head, a stage 2 prc head, or even a PP stage 2 59cc head.
Either way you will make more power and spend very similar money.

X-ZZ4

The reason I'm considering "wasting" money on these heads is I can get a set for $850......which seems pretty cheap.

But that's why I'm asking.....other than AFR's I don't really know what else is out there.

Do you have a link for more info on those heads you list? Know how much they cost? What vendors are good to buy them from????

Thanks in advance.....

Mighty Wings

I'm curious also, since I have a set of stock LS6 heads. I am undecided if I should have them ported and install big valves.

dug

iTrader: (10)

LS6 heads are ok for the money. They offer similar gains as the FAST intake for less money.

SS1875

iTrader: (34)

Check with Lingenfelter Performance Engineering, they get great results with the LS6 heads and have the numbers to prove it. Jeff @ Lingenfelter's is the man to talk with if you want to call them 1-260-724-2552. You might be suprised with the flow numbers compared to the other heads out there. The website address is www.lingenfelter.com.

Mighty Wings

I got the heads for free. I work at a dealership and they threw away the whole engine which had a nice hole on the side. I took off the heads and as they say, the rest is history.

Brian Tooley Racing

iTrader: (13)

We have had our CNC ported LS6 heads make 20 RHWP more then the AFR 205, but then they should, they have 20cc more port volume and 20 cfm more airflow, and can be done for $1500. Most customers are in the 450 RWHP with an LS6 intake.

JZ'sTA

iTrader: (23)

Take 850 and add a good spring kit.

These are just springs.
63-26918-16 Comp Cams 26918 Conical Spring (LS1/LS2 replacement) Suitable to .600 lift with more aggressive ramp-rate cams (Works with stock or Comp 772-16 Titanium Retainers) $159.99 Buy Wish

This is a whole kit which is typicially included when you buy ported heads.
63-26921-KIT Comp Cams 26921 Dual Spring Kit - Suitable to .650 lift with more aggressive ramp-rate cams - Kit includes valve springs, titanium retainers, spring seats, valve stem seals and instructions. $559.99 Buy Wish



Patroit has a stage 1 for 1000 bucks.
TEA has a stage 1 for 1000 as well.
PRC has their 5.3's for 1350.
TEA has a similar head for 1500 or so.
Patroit has a stage 2/stage 3 LS6 STYLE for under 1300 as well.
Now you can see why I refer to stock LS6 heads as a waste.
Now if you wanted a bad *** combo then LS6 castings can be superior after they are fully ported. Your now spending around 2300 dollars complete however including cores.
Check out TEA/PRC/PP/whoever in the sponsor area.
IMO the 5.3 TEAs are the best bang for the buck.

Mighty Wings

[QUOTE=X-ZZ4]Title pretty much says it all......I'm wondering how much power the stock LS6 "243" heads are capable of supporting......and what other mods (ie which cam) is getting you there?QUOTE]

So is anyone running stock LS6 Heads with a cam and bolt on's? Any horsepower/torque numbers?

X-ZZ4

Very good info......thanks!

X-ZZ4

I asked the same question over in the Z06 section at Corvette Forum. Here's some of the replies.....


So it looks like stock Z06 heads are up to the task of supporting around 425rwhp in some cases. The question is though, as shown by JZ's post, are they worth it - can you do better for the money? And I guess the answer is it depends how much do you have to spend on them. Now I've got a line on a very low mile set for just a couple hundred bucks....that is gonna be tough to turn away from. But for $850 as I said in my original post.....JZ is right.....that money plus a couple hundred would be much better spent on the options he layed out.

Thanks for all the info guys!

Mighty Wings

Thanks, for the info. I have 0 dollars invested in my set of heads , so I really dont have anything to lose. Yeah, for $850.00 dollars, there are better options out there.

BADFNZ

iTrader: (19)

I made 404/424 through an unlocked 3500 stall w/ STOCK ls6 heads and a TR224. The longblock was new, but this proves they're very well capable of performing without being ported. Porting would be better, but it isn't absolutely needed.

JZ'sTA

iTrader: (23)

Glad I was able to help.
I by no means think the 243 castings suck just feel there are better options for similar prices. Now if you get a set for free then thats hard to beat.
I just recieved a set of TEA stage 1 heads today.
I have some ported LS6 heads on the car now.
In 2 weeks when the tuner gets here I am going to dyno the LS6 heads, then pull them off and install the TEA stage 1's. Redyno the same day and get some good info.
Look for my post in a couple weeks.

X-ZZ4

I will......that will be very interesting. Thanks!

eb02z06

iTrader: (18)

My car stock LS6 heads 228/230 .571/.573 112+2 cam and all boltons (Tpis headers)420/399

G5X3 114 LG headerssame as above 427/400

G5X3 112 LG headersSame 435/405

G5X3 112 aluminum flywheel, Fast 90/90, EWP, 460/405

LS6 heads work-and for the price they are going for you can't go wrong.

dug

iTrader: (10)

Exactly, you can pick up a set for the same price as FASSST intake.

Joker

I have an LS6 crate engine with LT's, lid, free mods, TSP 242/248 .625, 114 LSA with PRC springs/rods making 432rwhp/390 tq. I plan to have my heads redone next.

While I respect the AFR's, TEA's, etc... as they're great products, you can take a set of factory LS6 heads, have them p/p'd, valves, etc, and they'll flow very, very well, capable of supporting just about whatever you might want to throw at them.

BLK02WS6

iTrader: (2)

I had stock LS6's with a 228/232, 588/588, 110 on my 6.0L and it made 385 rwhp through a TH400 and 12-bolt. I made 480 rwhp on a TNT 100 shot.