JZ'sTA

iTrader: (23)

I am just sheding some light on the CnC LPE heads.
Here is what LPE says they flow vs what my local shop's flow sheet reads. This thread is only started to help everyone out thinking about buying the heads.
They are milled 50 thousands I believe, and are LS6 castings.

LPE says------------- Local machine says

-----Int.- Exh. -----------Intake--Exhaust
200 150 117 -------------144.87--102.48
300 225 168--------------202.79--139.75
400 273 202--------------260.35--177.26
450 285 210-------------------------------
500 291 217--------------290.49--199.93
550 304 221-------------------------------
600 311 222--------------301.70--215.35
700 -----------------------292.53--222.35

All in all I would say that LPE is very honest with their results.
It is very easy for a flow bench to be different and the numbers are very close especially after 400.
Cool to see the heads don't loose that much at 700 lift.
Good work LPE, and hopefully this helps some out is considering the heads.
I would sell you mine, but after seeing the results I have 2 other sets of heads for sale because were keeping these.
Flowed real similar in compairson to the Absolute speed heads and will give much more compression.

jrp

iTrader: (16)

bench, bore, radius plate, pipe?

JZ'sTA

iTrader: (23)

Bench was a JMX bench or something like that.
The guy that made the bench has passed away.
Bore 3.9 bore, radius plate?????? He used clad if that is what your wondering. Pipe ='s NONE used.

Richard@WCCH

iTrader: (3)

JKM flow benches typically flow less than Super Flow benches by anywhere from 3%-10%. If you need anymore info about these benches you can contact me. I had to completely reconstruct mine because of a design flaw. In some ways they're better than a Super Flow and in others they're worse.

Richard

JZ'sTA

iTrader: (23)

Thanks Richard.
I knew the benches were different just didn't know up to a 10% difference.
JKM was the name as I called and verified.
I use this bench because it's local, and I like having a apples to apples comparision on my own stuff.
Anyways if this is the case then it makes the numbers that much closer together.
Again just sheding some light on the CnC program from LPE.

PREDATOR-Z

Also let us not forget that any mill will take away a little flow unless the tested LPE's were milled the same.
I say those are consistant #'s

JZ'sTA

iTrader: (23)

No arguement from me, I am acturally trying to brag about the fact that the numbers seem very legit.
As you can see in the origional post, where it says were keeping these heads.

JZ'sTA

iTrader: (23)

BTW just a quick update.
Using these heas on a 370 iron block, T rex cam, 12 bolt, 6 speed, 1 3/4 hookers and true duals the car made 487 peak on one dyno and 490 on another.
Heads must have worked pretty well.

KGSloan

those are some impressive dyno numbers.

thanks for the update

Ragtop 99

iTrader: (7)

Odd that they were down 10% at 300 lift, but within a few percent everywhere else.

zamboxl

iTrader: (1)

so he is swapping his heads what wrong with the old ones he was putting down around 600 rwhp with te=he gigles thats not enough?

nm dont bother asnwering that one i know the answer lol.

damn i think he might take u man, so when u gona put that 6.0 in ur car and post up some numbers?

JZ'sTA

iTrader: (23)

these are the heads that were on ox's car the night we were on the dyno until 3AM with your car.
I just never added a update.

JZ'sTA

iTrader: (23)

I agree but does the 300 lift number really mean anything in a race?

Greg_E

iTrader: (4)

Are these the GM Performance Parts heads?(machined by LPE for GM)
I think they use a different program to port the heads they sell under the LPE brand. In any case, I have the GMPP's and the flow numbers are pretty much in line. At the lower lifts, the numbers were VERY close to the LPE numbers. Mid lift numbers were between the two and at .600" I was a little lower, 292.
I'm sure the fact that they were flowed on three different benches, possibly using different methods, accounts for the differences. Thru stock cats,and with most of the bolt on's LS6 intake, LPE LT's etc. (no UD pulley) It made 403/386 with the LPE GT2-3 cam, which is a small cam by todays standards. When I bought the heads, they were excellent price vs performance. There are more choices now, but they still are a very good value IMO.

66deuce

iTrader: (1)

i had LPE do some work on my 5.3s i just installed.Ed Potter was very helpful and even showed me around the shop when i dropped off my heads.and he e-mailed me a couple of times after i picked up the heads to make sure everything was going all right.great bunch of guys.