Speed Demon

iTrader: (14)

I am thinking of trading my 6.0L home ported heads for a friend's CNC (out of Fl.) cylinder heads. These heads are called their stage III and have 2.02/1.57 Manley valves. His C5 made 411rwhp w/ a Hotcam, TPIS headers, tuning and other bolts ons.

Just wondering if anyone is running these, how do they perform and if you had any problems.

Thanks

muscratmauler

I do but they're not on yet
tuning date is scheduled for Feb. 21
should be ready

John

Speed Demon

iTrader: (14)

Do you have any pics? What are your head specs?
Flow numbers?

Is the bare valve guide exposed in the ports, ie. valve boss most removed?

rwb

I've got a set of CNC stage 2 heads from Thunder Racing. Haven't had any problems with them. That's about all I can say.

muscratmauler

LS6 heads milled with 60.0 cc chambers (measured with digital graduation setup) 2.050 IN. 1.60 EX

With the piston out the hole .007" it came out to just over 11.4 compression

No flow numbers he doesn't give them out, but flow numbers aren't everything anyway

I have a 224/228 .581/.588 112 XE-R cam
918 springs

Just degreed the cam last night. Checking piston to valve clearance Mon. night. HOPE IT'LL BE O.K.

This will be going through QTP headers (1 3/4") and either Carsounds highest flowing cats, which I have right now, or the new Random tech metallics if I can sell these Carsounds and finally through a loud mouth. Car will be trailered to Mufflex for custom y-pipe, Kateck oil pump, LG motorsports entire suspension and chassie products, stock 10 bolt (for now) ARP: rod, flywheel, head bolts
Bauer throttle body, Brian G. ram air, Carteck clutch, SLP billet steel flywheel, Mti clear lid, ASP underdrive pulley, pro 5.0, MTI line lock, spark plug indexing washers, all Redline fluids, Evan's cooling, etc., etc, etc.

Cartek will be tuning

I hope it all works out o.k.
I'd like to have Cartek's new package though. I have a feeling I won't even come close

anyway if you curious, you'll have to e-mail me after the 21st cause I will never remember to find this thread


John
probably forgeting a few yet but that's about it

JimMueller

iTrader: (9)

I've had Pete's CNC heads since September of 1999. Muscrat is right - Pete won't provide flow bench numbers. I have 2.02/1.57 Rev valves I believe. Only problems I had were caused by valvespring failure. Pete R&R'ed them and so far as I can tell they've been just as reliable since.

I've heard one guy which had the heads flowed in Arizona before they were sent to MTI. Supposedly they maxed out around 27x @ .550. I called Thunder once and they said they've never flowed them either since most customers are interested in the more expensive heads.

They work, but I wouldn't buy them again. Just not happy with the numbers from my first-gen heads. However, if it's an even trade you can't beat the price, and perhaps he's changed the CNC program in the past 4 years!

Yeah, I'd like to have a new Cartek or LGM package too <img border="0" alt="[cry]" title="" src="graemlins/gr_cry.gif" />

C_Williams

Worked on a set from a freinds Z06. CNC's work was great looking and the flow was very respectable -@.600 / 305i - 225e.

Speed Demon

iTrader: (14)

Jim,
I am sorry your combo didn't work out so well. Thanks for the info. On my home ported heads I made 386 rwhp, without tuning, LS1 intake, stock pulley, and stock MAF, T1 cam, Mac Headers no cats and Hooker cat back, home ported TB. Hopefully if I do swap heads with him I will make more power.

I don't have any flow numbers for the home ported heads but the intake port volume is 214cc.

Tim Sloper

Jim,

Why not get your tuning resolved before you start talking about the heads? To be honest your camshaft is relatively small and not nearly as aggressive as the newer cam profiles. There are a couple things to be done before you bad mouth the cylinder heads.

I'm not trying to defend CNC (I have no relationship with them at all) but you are misleading people with your post.

Tim

JimMueller

iTrader: (9)

Tim,

Speed Demon asked for experiences of those who owned them, and I offered mine to him.

I would say, however, that you do have an indirect relationship with CNC, since the shop that you perform your tuning work at endorses CNC Inc. heads. If you said anything derogatory about CNC I'm sure it would be frowned upon.

I'm curious what your direct experience has been with CNC's product, since that is the original question. You bought an ARE longblock with ARE heads, right? Richie had a stock shortblock, but picked ARE heads also. If the CNC's are so grand I'm curious why neither used CNC, especially since CNC is local to us?

The tune in the car is from Ed Wright. So you'll 'approve' me badmouthing the heads after I spend another $500 to switch from your competitors tuning to your own? What are the 'couple of things' that need to be done besides tuning?

Jim

Tim Sloper

Jim,

I have no preference on what cylinder heads people use nor do I endorse any paticular head porter. I benefit in no way shape or form because the shop I am associated with uses CNC heads.

My only direct experience with CNC heads are that I've dynoed and tuned a couple CNC H/C packages and I've also tuned a number of packages from other suppliers. They are all very close to each other... so much so that I would recommend price be the determining factor not flow #s or anything else. The camshaft, compression ratio, and tuning are going to have much more influence between cars than the cylinder heads.

As for my choosing ARE... that was 3 years ago when this entire market was very new. ARE at the time was one of the leaders in this stuff. I don't understand how my decision to use ARE 3 years ago relates to your comments and your car.

Jim, where did I say CNC was so grand? I never did. I merely commented on the fact that you are putting CNC in a bad light and until you get the tuning resolved how can you possibly comment on the cylinder heads? I've dynoed/tuned cars with the latest and greatest from some of the newer head porters... your car for the camshaft it has is within 3-4% of their peak numbers. Atleast 2% of that is in your tuning... you have the data.

I don't care who you use for tuning. I have the data from your car and I know what needs to be corrected. I made you an offer you said yourself you could not refuse as you were hesitant to leave Ed W. If you decide to not take us up on it thats fine but until you get the tuning resolved you can not point fingers at your cylinder heads. Obviously you know the tuning needs work as you drove all the way to Ed W. for a dyno tune. Unfortunately he wasn't able to work with the car for reasons beyond his control.

I just don't like seeing a business get potentially hurt because someone isn't providing a complete picture when they comment on their products.

Tim

<small>[ February 02, 2003, 11:55 AM: Message edited by: Tim Sloper ]</small>

Richie Carbone

iTrader: (3)

Jim, I recall your car making 405 RWHP 380 RWTQ before you went to Ed's to have the car dyno tuned, where the car couldn't be tuned correctly due to a run of bad fuel. Your car made the same #'s as my ARE pkg did, obviously the problem is in the tune not the heads.

We made you an offer where you have nothing to lose.

Your A/F and timing are out to lunch(I'm not bad mouthing Ed here) so until you have that corrected you cannot give an accurate assesment of how the car will perform.

<img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

JimMueller

iTrader: (9)

Out of courtesy to Speed Demons' thread, I'm not going to continue this non-constructive (imho) tangent to his thread.

If someone wishes to discuss it privately, I'll try to be constructive and objective, even if it's C&S <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> <img border="0" title="" alt="[Razz]" src="gr_images/icons/tongue.gif" /> <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

HITMANSS

I had the CNC Stage III heads, & ran them for a couple years. I dynoed @ 360 HP w/ the stock cam, through Hooker shorties & stock cats.

I think I already sent you a pic of the intake port, & the way the area around the valve has been removed. If that was someone else, let me know & I'll post the pic.

The intake ports seem fairly large to me, but I've never cc'd them, or flowed the heads.

Speed Demon

iTrader: (14)

Does anyone have any new news on their CNC head set up?

I just tore mine down today and cc'd the port/chamber volumes.

Hopefully getting them flowed tomorrow.