INVISIBLEZ

iTrader: (45)

Can anyone give me this info?? I'm looking @ a set.

Ed Potter @ LPE

iTrader: (1)

Hi, we actually do the CNC work on those heads for GM, let me give you some info:

the heads are made in 2 versions, a 60cc and a 62cc chamber. The 60cc chamber will give you about 11.3:1 compression on a stock bottom end.
Flow numbers:

Int. Exh.
200 150 117
300 225 168
400 273 202
450 285 210
500 291 217
550 304 221
600 311 222

They still use the LS6 sodium filled valves, stock size, and LS6 valvesprings. The 60cc versions have been milled approx. .055" to achieve this chamber size, so you will have to notch the 4 corner bolt recesses to make your intake fit, but it's no big deal. Over all, a very good set of heads for the price considering your getting new, genuine GM LS6 heads, CNC ported for about $1900.00 outright.

Fell free to let me know if I can answer any other questions for you.

Ed

87f383

I've been searching high and low for the part numbers for these heads... but I suck at the search function... can you toss me some part numbers? for the 62cc heads?

RyanJ

www.sdpc2000.com

jrp

iTrader: (16)

https://ls1tech.com/forums/showpost....3&postcount=28

Ed Potter @ LPE

iTrader: (1)

the 60cc chamber is GM PN# 88958622

I was mistaken on the street version, those are assembled at 65cc which is the factory chamber size on an LS6 head

the 65cc chamber is GM PN#88958665


I think they are currently back ordered but our local dealer has a set of each on the shelf if anybody is looking for them.

Hope this helps,
Ed

INVISIBLEZ

iTrader: (45)

Ed the heads I am buying are off of David Farmer's SCCA vette. 65cc chambers. I do planned to have them milled a bit. I also am gonna have them smoothed, not ported, to get rid of the cnc lines. Would the above flow numbers still apply to these heads being they're 65cc??

DavidNJ

Ok, Ed and JRP, those number differ. Are they the same head?

Ed, are your numbers on a stock bore?

Thanks,

David

jrp

iTrader: (16)

the MTI numbers are from a test J-Rod did a while back if i remember right, you'd have to ask him specifics as i dont know the bore size, bench, radius inlet or pipe, ect.

H&H Performance Depot

iTrader: (1)

What kind of SCCA car does he run?

ONEBADWS6

iTrader: (22)

LPE is a great shop but I'd bet money they don't flow that well, especaily 273cfm at .400 lift.

Ed Potter @ LPE

iTrader: (1)

Really?? how much?

I have a customer in Chicago who just took a set off his Vette to do something different. I'm sure he won't mind taking them to the flowbench of your choice and having them flowed, as long as you agree to post the results!

You will see a slight variance from bench to bench, and our numbers are on a stock bore,before milling, so that will have some effect. J-Rod's flow chart was very accurate in my opinion, and if you know him, you'll know that he didn't leave out any test details.

Hand sanding out the CNC marks will give you a few additional CFM, so that's going to make them even better. .

Ed

ONEBADWS6

iTrader: (22)

The guy I use, High Flow heads in Alsip has #'s on 3 sets of Patriot heads, 4 sets of my Tea heads and a set of Stg 3 GTP heads all from his bench, that would be a good apples to apples test if you want. If they do flow the #'s stated they are 1 of the best heads out there right now, no matter the price.

ONEBADWS6

iTrader: (22)

ARE Stage 3 LS6 heads complete THese ARE 243 Castings, not the fake wannabe LS6 heads....
Less than 500 miles on them
Decked .045
Heads come with titanium locks and retainers
Have 1.55 Dual Springs
Stainless valves(2.100,1.60 exhaust)
Flow the following
Lift Intake Exhaust
100 74 66
200 135 127
300 204 148
400 260 199
500 293 222
550 306 228
600 321 231
650 328 232

Chamber CC's are 61.5 CC's


See what I mean

Ed Potter @ LPE

iTrader: (1)

Since these heads are using 2.100" valves, they don't really compare to the GMPP heads using stock LS6 valves. It is interesting that these numbers are only marginally better than what I posted, with the big valve, I would expect more flow. It's probably hurting you if you're running this on a stock bore, we don't see big power gains from a 2.100 untill we open up the bore to 4.125" which un-shrouds the intake valve.
Here's our LS6 flow numbers with a 2.100" valve:

Int. Exh.
200 160 123
300 236 177
400 284 209
450 302 218
500 320 221
550 334 224
600 339 228


I'll call my guy and see if he wants to take a ride to Alsip

The GM heads are an excellent head, they are also the cheapest price for a real LS6 head.

goober35

iTrader: (1)

Ouch the ARE Stage 3 heads got there *** handed to them.

I am running these heads but the are the 66cc chambers from when they first cam out but the are the same flow numbers. I will dyno my car when i bet the motor broken in. I made 390rwhp unlocked on what is said to be a low dyno(Only 2 people have ever broken 400hp A4 unlocked on this dyno.)

Bill's 02 Z-28 SS

Hi Ed,
I might have missed this but I understand you folks are the one that do the NC machining for the GMPP LS6 Heads. Is that true? I really like my heads.
Bill

INVISIBLEZ

iTrader: (45)

You are correct Bill, LPE has the contract with GM for the performance parts LS6 CNC heads. So it's LPE's CNC design.

INVISIBLEZ

iTrader: (45)

He was running a yellow Z06 vette. He's now sold his car and is moving up to a C6.

INVISIBLEZ

iTrader: (45)

Damn talk about a , too bad for the losing opposing team.
LPE does have the reputation for having 8 second TT vettes, that in itself speaks volumes!!!!