11 Bravo

iTrader: (3)

I just noticed that. Besides the fact it peaks mid 500's, the powerband looks like a h/c stock bottom end engine. Not flat at all. Something ain't right there.

Cary@Perf-Induction

iTrader: (1)

Yes there are other etp ls7 heads out there that make a lot more power than that. I think there may be a mismatch. Our heads are very much like the gm ls7 heads with an exception to a better exhaust port. So, for comparison sake. I do have other customers running these with real good numbers. I don't know what cam this engine has in it. or the compression etc.

vmax1500

Hey Cary, I have set of ETP LS7 style heads going into my 427 Firebird within the next couple of days... there has been alot of talk lately of the ETP LS7 head vs. the GM LS7 head... what would you say are the key benefits of going with your head?

Cary@Perf-Induction

iTrader: (1)

What is better,well, the reason that we set off to make a LS7 aftermarket head is to fill the voids in a "race" engine that Gm left out for production reasons, thick deck, reinforced rocker pad area, no machining required to use Jesel rockers, except a little clearancing for the tail end of the rocker, which we have fixed, longer valve/raised spring pads for use with larger springs, and additional room for porting, slightly larger higher flowing exhaust port, slightly larger intake runner (5 cc's) 5/16 valve guides for use with traditional s/s and titanium valves. the intake runner shape and combustion chamber are very close to that of the GM LS7. The stock LS7 ports work real well, that, we weren't set out to make better. It was more of a structural issue. The LS7 heads flow so well that we were sure it would soon set out to be the LSX "race head" . not to mention the factory manifold does not have the deficiencies that the ls6 does for larger engines. That is why we started producing a small bore version that is scaled slightly smaller proportionately to the bore size than the big bore version.

vmax1500

Yes it is... thanks for the concern...

SlickVert

iTrader: (5)

Anyone running ET LS7 4" bore head yet?
Dyno or ET #'s
Bob

Reckless

iTrader: (9)

Nice results. I agree the cam selection must be holding it back. We made 545rwhp through high flow CATs 2 years ago with a C5R block and LS6 heads. There has got to be a lot left on the table here.

Spinmonster

Was this a low compression attempt? What was the static set at?

beardWS6

iTrader: (1)

Just keep working on it! It will all come out in the end!!

mike c.

iTrader: (1)

those dyno #'s seem a tad low to me for a 427ci. i was told the ported gm ls7 head out does the etp head and LME is getting over 600hp and over 500tq out of their 427ci using a ported gm ls7 heads.there has to be more in that somewhere.