Dragaholic

iTrader: (180)

So a stock L92 head is flowing 310-320 cfm? That's pretty good for an untouched GM head right? How much more can be expected once reworked? I'm looking at the ETP 255s right now and at .650" valve lift, they flow 357 cfm.

By the way, this L76 intake, what engine does it come off of? I assume its a GM intake right? 2 versions, carb and fuel injected? Just wana make sure that I'm understanding all of this correctly.

Wnts2Go10O

iTrader: (12)

i think they were talking about the intake flowing that.

SStrokerAce

iTrader: (2)

With a worked head and a untouched intake manifold (L76) the port will flow 310-320cfm with the intake bolted on. Ported versions of the L92 can move 360cfm, a good valve job can get 350cfm.

The L76 comes off of a Holden. It's running a small small cam, a 6.0L bottom end and a that intake to be called the L76 engine designation.



Holden is using it in their big RWD cars, not the performance cars oddly enough. They use the LS2 for that, but that has higher emissions. They are using the L76 due to the better chamber and burn that it has for lower emissions. Another good point for us, BETTER BURN! I'm sure the timy cam that they put in the L76 is for emissions, but to get better power output and more midrange TQ they needed better cylinder heads.

The 6.0L L76 is a 353 HP motor. (264kW is what the Aussies list their power in)

Bret

Kenova

iTrader: (4)

I can't be 100% sure, but that manifold sure looks a lot like the manifolds on the 2008 full size trucks. They are a three piece design, glued together. Guess I'll have to look them over for part numbers.
Ken

Dragaholic

iTrader: (180)

SStrokerAce, so when head companies advertise flow numbers, is it just the heads or with the intake on?

Ok, so with a reworked L92 heads and an untouched L76, the head will flow 310-320? What do you mean reworked in this case?

Then you state that with the L92 being ported, it should flow 360. Then with a good valve job, 350. So are you saying with a good port/polish job on the L92 heads, they should flow 360 and with a valve job only, they should flow 350?

280Z28

iTrader: (1)

Mine flow 321@.600 untouched heads, off-the-shelf GM valves only. He's saying the intake is matched well with the heads and flows great, so the heads with intake should still flow 310-320 untouched. He may mean with a valve job on that last part; I'll post results once I get my intake for sure.

SStrokerAce

iTrader: (2)

People list flow numbers with the heads ported WITHOUT a intake on the heads.

Now with a intake on the heads most LS stuff will max out under 300cfm.

Yes VJ only can get 350cfm, and full porting will be over 360cfm. The idea here is not just raw flow, but quality flow and that's something these heads can do easily. You can make more flow numbers (higher CFM) but lose quality in the process.

The L92's with the L76 intake everything stock is not going to move 310-320cfm with the intake bolted to the heads on a bench, but it has that potential.

Bret

WKMCD

iTrader: (2)

So if you were to compare a stock L92/L76 setup to a popular 225 runner head and a FAST - where would you be?

Wnts2Go10O

iTrader: (12)

i think even a mildy ported l92 head and stock intake would destroy the 225/fast combo

Dragaholic

iTrader: (180)

Here's my dilemma, I'm torn between setups. L92 heads with L76 intake, L92 heads with sheet metal intake, or ETP heads (not sure which ones yet, either 245s or 255s since 265s are too expensive for me) and a sheet metal intake. I may even stick with my FAST 90mm if the funds aren't there, and then upgrade later when they do become available.

However, the biggest holdback is the claims out. All this stuff is so new, there's hardly anything out there as far as setups, times, numbers, etc. The L92/L76 stuff seems pretty reasonable with price, but once reworked, I wonder if its really going to shine. What do you guys think I should do?

WKMCD

iTrader: (2)

I choose to try the L92/L76 setup on the 402 we're doing for my M6 C5 just because it hasn't been done a thousand times before and on paper will give me what I want. I don't track my car and don't care about every last .01 of a second or last ounce of RWHP. It's not a dyno queen but it's still going to be a very strong "Gentleman's Cruiser".

SStrokerAce (Bret Bauer) has designed a cam for this setup that should do exactly what I want and make some very good numbers.

We hope to have it running in about 3 weeks....If Phil99vette can get it done.

Wnts2Go10O

iTrader: (12)

well look at it this way, its bigger brother is doing just fine (the ls7 head). it wouldnt be rash to say that these heads will perform right along with the ls7 head because they share a lot in terms of design

Dragaholic

iTrader: (180)

So the GM LS7 head has a lot of the same features that the L92 heads have? You state that they're doing fine, are you talking in terms of a stock L92 head or reworked? What kind of numbers?

Wnts2Go10O

iTrader: (12)

the ls7's are a bigger verion so to speak. theyve been making some damn good power. one can only think the l92s will be propotionally the same.

rons 00z

iTrader: (10)

hey guys just thought of it i have a friend in austraila right now i'm going to get a hold of him and see what i can do.

WKMCD

iTrader: (2)

I tried that a 2 months ago...with no luck.

rons 00z

iTrader: (10)

well i just talked to him yesterday he said he'll check around

StreetnStrip

iTrader: (7)

Well my guy is a big cheese at GM and he acts like he's the onloy one able to get them as of right now.