Closer_2001

iTrader: (6)

Looking for your input to a specific question:

If I am going to stay with the stock 02-up LS6 Cam (.547/.550 Lift)

Does it make more sense to have better mid lift numbers assuming a comparable port velocity?

Comparing the 205 cc AFR head to the PRC CNCd LS6 Head.

PRC at .500 Lift = 287 CFM

AFR at .500 Lift = 281 CFM

AFRs cost considerably more and granted have better springs, etc. I am planning to swap my Sodium Valves to the PRCs so it really doesn't matter to me. The PRC #s are done using stock valves.

Your comments are welcomed...

Why LS6 cam?

This is going in a CTS-V and I like it to be docile when carrying family and clients. Other mods include LPE CAI, Kooks LT Headers, Hi-Flow Cats, Stock Cat-Back and Tuning.

I had a G5X-3 in a GTO...which was nasty, but a little much with customers in the car.

Future mod beyond the heads might be a Magnuson.

E

fastmatt98

iTrader: (27)

Well I think I'm going with the PRC's just for the price of course. Oh I had a LPE GT2-3 cam in that sounded stock I mean really it was incredible how stock sounding it was lol . Gave me a great pull up to 6300 rpm.

CAT3

iTrader: (9)

What about the Dart heads? Thought I'd throw that out before anyone else If it were for mild performance with "customer friendly" in mind, I'd go PP personally. Good quality low cost heads.

proautoman

Myron @TPIS (owner) has just released a cam for the very reason you state He owns a CTSV and say the cam idles like sstock but
is worth 38 Ft lbs 952 448 6021 give em a call

Beast96Z

iTrader: (21)

You need to look into the port volume of the PRC's. There probablly a fair amount larger than the AFR's.

JZ'sTA

iTrader: (23)

I think if your staying with the Z06 cam you have tons of head options.
AFR's, TEA 5.3's, PRC's, etc. With your cam there isn't going to be a huge difference from head to head. Be happy if you pick up 20 RWHP over the stock LS6 heads with this cam.
BTW check out the cheeter cam from thunder racing.
I personially believe there are a ton of cam options that would be better then the Z06 cam. A 220/224 on XER ramp rates and a 117 LSA would be awsome for a stealthy combo and more power then the LS6 cam.
I know because I have used it before.

Closer_2001

iTrader: (6)

I am just looking for 20 rwhp, so that would work.

I've thought about the CheaTR, but want to try heads only due to the easier install. I did the HC on my GTO myself, but getting the A/C out of the way looks trickier on the V.

Thanks for all the replys...

I will check out the Darts.

Rescue Ranger

iTrader: (10)

i just bought some patriot stage 2 59cc heads w/ a cartek cam. I'll post up some results soon for ya, but i picked them on what you got for the price.. i don't really have a review yet tho

Patrick G

iTrader: (14)

The airspeed is so much higher on AFR 205s, you get the hp advantages, plus better fuel economy and throttle response. Think about it, no other head on the market gives you such high hp gains plus all the driveability benefits.

FWIW, my AFR 225s flowed about 20 cfm better than the 205s at .600 lift, but they only gained me 5 rwhp and 5 rwtq. In the process, I loss low speed driveability and about 2 mpgs on the highway. Keep this in mind when you're shopping flow numbers only. The 205s are the ****, flow numbers or not. The hp has to be feeled to be believed.

JZ'sTA

iTrader: (23)

No other head can give this? Why can elderbrock, Dart, ETP, Trick Flow?
EB, and Dart are also 205's and the ETP and Trick flows are 215's but have a better valve angle. 11* and 13.5* vs 15*.
I am just being a smart *** more or less.
I agree with what your saying just dont think a 2000+ dollar set of AFR's or ETP's are really worth it with a Z06 cam. Now if you plan on geting a better cam later then buying the better heads now is smart.

Closer_2001

iTrader: (6)

Exactly...

I don't plan to add a cam...so are the PRCs = to the AFRs (high priced heads) with the LS6 cam ?

If we are talking about the AFRs offering better "feel," I would assume this sensation would be translated into more TQ at lower RPMs ?

JZ'sTA

iTrader: (23)

The AFR's will still be better. They will make more HP and torque through the RPM band. The car will be a bit faster. Worth a extra 1200 bucks. On this one not to me, and trust me I have no problem spending money on heads.
For the extra 1200 bucks you could buy a cam, and pay for the install. I bet a better stealthy cam and the PRC LS6ers will wipe the Z06 can and AFR's.

Closer_2001

iTrader: (6)

That affirms it...

Throw the PRCs on it, then if I want to upgrade the cam - I can later. The only downside will be swapping the springs in the car.

uberLS-1

how does that AFFIRM it...
JZ'sTA is right, a head only using AFR's will probably lose to a head and cam PRC...and honestly brand doesn't really matter. But we are only talking dragstrip performance here, not the day to day grind.

We all know the CTS-V is a little boaty...personally, I would opt for more low-end torque and throttle response, and what was said is the AFR's tend to be the best in that category while providing a substantial performance increase.

I doubt you are strapped for cash (Note your sig), so why not go for it. A little extra money, a few more smiles, not too mention the reliability of a better casting....

Ok, my opinion was voiced now I feel better.

Tony Mamo @ AFR

iTrader: (13)

Couldn't agree more....The 205's are tailer made for this application. I assume if you were focusing on the strip side of a street/strip dual purpose vehicle you would have opted for a lighter F or Y-Body....NOT the Caddy. The AFR 205's are ideal for a dual purpose street/strip car, especially ones wanting to place the emphasis on street (and hold their own quite well against much larger heads in strip applications as well).

Let's face it....this application is perfect for all the attributes the AFR 205's can offer you. A high flowing efficient cylinder head with a small cross sectional area will provide better low and midrange TQ (much needed in this application), increased snap and throttle response, better fuel economy, and will still make excellent peak power. High airspeed ports will provide better acceleration in the real world of day to day driving and the dragstrip.

The only reason not to get the AFR's are cost (if you feel the benefits they offer aren't worth the added expense), but the benefits they offer you are very real and if your budget allowed, their purchase will put a smile on your face every day you have the opportunity to drive it.

Don't skimp on heads....its the most important decision you will make when it comes to your combination and ultimately the end results on the chassis dyno, street, and track.

Feel free to contact me at AFR if you have any questions or concerns

Regards,
Tony M.
(818)890-0616 Ext 109

Ed Curtis

He he he.. Yeah... my two ton goat runs pretty well with those puny 205 heads, stock short block and 3.46 gears...

Ed

gollum

iTrader: (1)

Patrick G pretty much summed it up. Thanks

P.S. Tony warned us long ago about this.

greenwood

not to say anything bad tony why do the afr 205 need say 32-33* total
and a pos 5.7 may only take 28 -29 to make the same power

uberLS-1

Not to speak for tony, but maybe less air/fuel for the timing to lead into? Just a thought...
assuming that was the only variable with the compression and quench remaining the same...

Ksett

The AFR's are your best choice if you can afford them. They have a smaller 205cc intake runner with good flow at .500 which means higher velocity and more power. I would think the intake runner on the cnc'd head would be at least 230cc making much less velocity at .500 which equates to less power.
I'd find out what the intake runner is on the cnc'd LS6 heads.