Ole Blue

I am trying to decide what heads to buy for my 99 A4Z28 3.23. However, I saw some CNC Scoggin Dickey LS6 heads that flowed over 300cfm @ 550 inch lift for $985 compared to stage 2 LS1 heads which I know are much higher and I don't know the flow numbers on the stage 2 heads. These heads will compliment a 224/.581 cam with a 114 lobe center with all the bolt ons except a TB. What heads would ya'll buy????????? <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" />

99 Black Bird T/A

iTrader: (4)

I was faced with the same choice a few months ago. If your looking at quailty Stage 2 heads like TEA's 5.3's etc, vs the LS6 Stage 1 heads, I don't think you can make a bad choice. It's a win win either way.

I wanted good dual springs (Comp 987's)to avoid spring issues so I went with the TEA's. The 224 XE-R cam like your thinking about will be hard on valve springs. The cam your looking at is very similar to the one I have. Retail on the TEA's is ~$1,800

If you get the LS6 heads, I would upgrade to dual springs personally. Now a lot of folks are going to tell you their 918's work fine with the same or bigger cam and they will but the 918's will fatigue quicker than the dual 987's will.

I'm happy with the numbers my car made, no dyno tricks as driven in off the street. If my clutch had not started sticking (slipping) I think the numbers would have been a tad higher. Note I don't have an underdrive pulley like most others do. I went with the ATI dampner, which actually weight 1 lbs more than stock, to give the bottom end the best chance of living a long time.

11 Bravo

iTrader: (3)

I'm a budget guy like you, Old Blue <img border="0" title="" alt="[Razz]" src="gr_images/icons/tongue.gif" /> and I considered the LS6 heads, but because I want double springs with my .570 lift cam I'm going to get TEA stage 2's. It ends up being close to the same price, but I'll have peice of mind on the springs, and a little more power. If I was running a hot cam or something I'd get the SDPC ls6's.

JFM-jr

iTrader: (23)

Budget bang for the buck?Check out Absolute Speeds stage2 heads on the banner to the right.These are quality heads for the money and the flow numbers are great.Thru R&D the flow numbers have improved and are a bit better than what the website has posted.Hand ported Stage 2 head with Manley valves (2.02/1.57) the 987's are I believe an extra 200 dollars otherwise the 918's are included in the 1,499 price.The 987's would be the way to go much less fatigue=more reliable.My fathers car made over 400rwhp thru an unlocked A4 high stall with the Absolute stage 2's the TR224 563/563 112lsa he has all of the bolt ons as well (LS6 intake,ported TB,pulley,headers-no cats,lid,3:42,YTP4400).Very happy with the setup.

Ed Potter @ LPE

iTrader: (1)

ol blue -
I would be happy to provide you with stage 2 LS1 flow numbers, or any other information you need. The LS6 heads from Scoggin-Dickey are probably the best bang for the buck deal around right now. They are CNC ported, and assembled by us, and for the price of 985.00 per head, you would have stage 1 CNC LS6 heads for $1970.00, and you would also still have your LS1 core heads to sell.

Now I'm sure all of the supporters of other shops are going to jump in and say "shop X will give you a hand ported head that's better and cheaper"
But, the fact is a CNC head is better because it is the same every time.

Let me know if you have any other questions,
Ed

J-Rod

LS6 Heads
<img src="http://users3.ev1.net/~black_ops/heads/ls6%20heads.jpg" alt=" - " />

All Heads
<img src="http://users3.ev1.net/~black_ops/heads/all%20heads.jpg" alt=" - " />

LOnSLO

iTrader: (15)

Awesome work J-Rod. Finally, a real comparison of different heads on the same flowbench.

J-Rod

Sorry to disappoint you, but those numbers were taken from different benches. Most of them were gained by taking the information from posts on this and other forums. Let me cite an example. Look at Andy from A&A Corvette's stock Z06 numbers vs the others that I have, there is about a 20cfm difference (the column in blue). Can't say if one bench is wrong, or what the variance was caused by... But, it gives you an idea of what is out there.

P.S. If anyone has any other flow sheets for ported or unported heads, please post them, or send them to me so I can include them in the comparison.

Ed Potter @ LPE

iTrader: (1)

J-Rod -
Thanks for posting the now famous head flow chart. You have really done your homework, and it gives people an idea of how different heads compare. It is based on everybody's advertised numbers, so it isn't quite as accurate as a back to back flow test, but it does give you a good idea of where a particular set of heads will stand. Thanks for doing the work to compile this chart, it gives us all something useful to work with.

Ed

JFM-jr

iTrader: (23)

ED, What type of Valves and springs come with that setup?Are those posted flow numbers and runner cc's correct?

J-Rod

I have modified the spreadsheet, yet again. Rather than post a screen shot of each iteration, I have posted it to my webspace.

http://users3.ev1.net/~black_ops/hea...s-01-03-03.htm

This spreadsheet has several section
Sheet 1 is all heads.
Sheet 2 is all LS6 heads.
Sheet 3 is all heads (raw numbers) without CFM comparison.
Sheet 4 is all LS6 (raw numbers) without CFM comparison.
Sheet5 is GMHTP test of head flow with and without Intake manifold in place.


If anyone else has any further numbers let me know, and I will update the spreadsheet.

LS1derfull

J-Rod , i have sent you my more current flow info for my 5.7 LS1 heads but i see you only added the ARE castings i flow tested. The flow you have posted for my work is my very early design and its much lower flow than my latest stock valve work. If you could update my numbers i would greatly appreciate it, thanks, Jeff.