52172

iTrader: (2)

Are these a new casting? I would imagine they must be since the valve angle is 11 deg vs 15 degree. This is the same angle as the upcoming ls7 heads. Do they require offset rocker arms? The flow numbers look like they are the finest heads around.

Phil99vette

iTrader: (11)

They are new castings. Notes:
Require standoff for stock rockers or Jesel ~$100
11 degree vs 15 degree
.800" thick deck
~.50-.75" taller valve cover mounting height(no more spacers)
Many different runners available 215,225,240,255,265
Combustion Chambers 37-72cc
Solid or Hyd roller

I am building 2 346s with these heads to see how they compare to other builds we have completed. We're really anxious to see how much faster this motor is going to go over my current setup which flies.
Phil

Beast96Z

iTrader: (21)

Yes, these are new castings. Only the 265's require the offset Jesel rockers. As stated above, the other sizes use some sort of pedestal with the stock rockers.

JZ'sTA

iTrader: (23)

Bad *** heads. Best designed heads from what I have seen.

52172

iTrader: (2)

They look like the nicest heads available today! I like the fact that you dont need offset rocker arms. I plan on getting new heads for a resleeved ls1 block 4.200 using stock crank all bore 401 motor and was going to wait and get ls7 heads and intake to use on top, which I think might make more power even over these heads since I can utilize the new ls7 intake which has got to outflow the fast 90 don't you think? I imagine you need to use the fast 90 with these new heads which even with the 90 mm tb opening limit the intake flow I hear?

Beast96Z

iTrader: (21)

ET's new LS-1 style 265's coupled with their new intake is rumored to surpass the GM LS-7 head/intake and their own LS-7 head/GM LS7 intake. This is assuming that you can wait for their intake to be finished. Using a FAST with the 265's is a good solution for the meantime if it means more HP in the end. You should also check with the person doing the heads to see if they can even open up the chambers to 4.200. A 4.155" may be more suitable. You don't want to max bore your block on the first go round any way.

Cary@Perf-Induction

iTrader: (1)

if you want the ls7, we also make that from our casting, and it adds all the features of the thick deck and slightly revised ports. but the ls7 manifold will be a direct bolt on for that. as far as the other versions, they should use a fast intake to reap the benefits of the heads.

JS

iTrader: (4)

Is your S1 heads a 11 degree
And is the S1 heads a 215 runner

52172

iTrader: (2)

I never knew et was coming out with a new intake manifold? When is it supposed to be finished and how will it compare to the ls7 intake? If the new manifold will outflow an ls7 manifold it will be worth the wait I want to do it right the first time. I can't imagine how the ls1 port design and this new manifold could ever outflow the ls7 rectangular intake ports and their new intake? ET what is your opinion?

I just heard from steve and he recommends a bore of 4.18 or 4.185 can the 265 heads be opened up to this bore? How will the new manifold compare to the ls7 manifold as I don't want the manifold to compromise the head flow any.

Beast96Z

iTrader: (21)

I asked the same question to Craig@ET the other day. I had already ordered my 265's and I wanted to make sure I didn't make a mistake by going with the LS-1 port vs. the LS-7. He told me that with the ET manifold, the 265 LS-1 would out perform the comprable LS-7 head and intake. He did say that the intake would not be avalible till next year though. I'm just gonna roll with my ported FAST for now, which should have similar charecteristics to the LS-7 intake as far as flow is concerned. As for the performance of the LS-7 intake, not many, if any people around here have tested them for us to speculate on there performance. It's hard to say how well or bad they will work if no one has one to test. Every one got there panties in a wad about the 90mm LS-2 intake and it turned out to be a piece of junk. You see what I choose to do, but in your situation, you can either go with the LS1 style port and a FAST 90 until the ET manifold is out, or you can go in blind and get the LS-7 style with a speculative intake that may or may not perform.