JPJBC

iTrader: (14)

just found this website with 32 valve heads. check out the dyno numbers <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> web page i bet those things cost a fortune.

AlonzoVersion 1.0

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by JPJBC:
<strong>just found this website with 32 valve heads. check out the dyno numbers <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> web page i bet those things cost a fortune.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Those look very nice. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

LEO

iTrader: (3)

Do they make a bolt-on LS1 head?

JPR

I have alot of experience with these heads, if anyone has questions about them, I would be glad to talk about them. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> . But, there are not for the LS1 application <img border="0" title="" alt="[Sad]" src="gr_sad.gif" /> .

Miles in Michigan

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by JPR:
<strong>I have alot of experience with these heads, if anyone has questions about them, I would be glad to talk about them. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> . But, there are not for the LS1 application <img border="0" title="" alt="[Sad]" src="gr_sad.gif" /> .</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Are they DOHC, or still just the one camshaft in the block?

JPR

Miles,
The camshaft still resides in the block, the cam that has to be used is a little over .420 - .450 lift, and the rockers that are monted on the twin shafts are 1.4 ratio. The only few drawbacks there is about running these heads are.

1. The DS valve cover is a VERY tight fit on the F-bodys. has to be modded a bit to clear the PBB.

2. There is block clearancing required for the exhaust actuating pushrods.

3. Custom Hooker headers with flange adapters needed.

4. Custom length spark plug wires and plug boots along with custom spark plugs from another application (I think from a motorcycle?)

5. LT4 intake manifold needs to be used for the LT1 application.

6. They are VERY heavy too, but the power to weight ratio trade off is well worth it.

Here are the flow figures I get out of there S2 heads. With intake installed W/58mm TB at 28 ".

.100 87
.200 185
.300 231
.400 263
.450 291
.500 321
.525 338
You don't even want to see the exhaust numbers! There sick!

There good flow numbers for twin intake valves non the less, but you can't run a high lift cam in a "retro fit" configuration unless you cut 4 "eye brows" on the piston tops. In a nut shell, if you want all the performance that these heads have to offer, you basicly have to build the motor around them a little. These are a wonderfully designed heads that have a common inake / exhaust tracts that split into 2 bowls half way into the runners (Like the Honda/motorcycle technology). My ultimate configuration for these heads would be a solid roller cam thats high lift to .550 with 406 cubic inches along with a T6 turbo charger at 14 psi, I think over 1,000 horses can be realized. The rockers are manually adjustable at the piviot point to the valve stem. And BTW.... These heads are lots of $$$$$ !! And they used to be marketed under the name Dominion Racing.

<small>[ May 19, 2002, 11:55 AM: Message edited by: JPR ]</small>

ChrisB

What kind of power did they make?

Also the flow numbers look good, but did you get any mixture motions measurments (I guess mainly tumble with a 4v head?) From what I have seen this is a problem with 4v heads - eps. on large bores.

Chris

Fulton 1

iTrader: (9)

Wasn't it just a few years ago that we heard GM was testing 32V heads on the LS1/6 engines for possible future production use? I distinctly remember it being rumored that 430+ fwhp was being seen with such a setup. This was of course with the single cam like the Arao heads. I haven't heard any more about this in the last year or two...

Miles in Michigan

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Fulton 1:
<strong>Wasn't it just a few years ago that we heard GM was testing 32V heads on the LS1/6 engines for possible future production use? I distinctly remember it being rumored that 430+ fwhp was being seen with such a setup. This was of course with the single cam like the Arao heads. I haven't heard any more about this in the last year or two...</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I had heard about the two-cam-in-block GM V8 a few years ago, and it looks like they are building it. It's 3 valves/cylider, 2 intake and 1 exhaust.

http://www.gminsidenews.com/xv82.htm

It'll also have variable valve timing on the intake side.

The only bad thing (that I see) is that it'll be 70 degrees instead of 90, and hence will require a balance shaft.

DCPunkSteve

I used to have a set of the Dominion heads about 3 years ago, but never got to put them onto the engine. It's a pretty easy fitment though, reguires only minor clearencing of the exhaust pushrods. I got them for $3400 back then, and ended up trading them for part of the cost of a paint job, and body work. Don't know how much they cost now, but I would probably buy a set if I ever went back to a regular SBC. too bad they don't make them for GenIIIs