more updates. Stage heads, article section

[SappySE107]

http://wot-tech.com/index.php?page=60V6-Main-Page

The articles from the store have been moved to the wot-tech site. Might need to be reorganized? Suggestions, comments, ideas, etc would be awesome.

Also, 3 stages of 3100/3400 heads. Besides pics, which we should have in a few days, what do you think? The old listings will remain but need to be renamed to "expert mode" or something like that because I know it confuses a lot of people.

Stage 1 3100/3400
Stage 2 3100/3400
Stage 3 3100/3400

[3400-95-Modified]

I'm liking the more custom selections you can make on the heads when you go to order them.

I have a 4k miles set of 3500 heads waiting for special treatment.

Do your stage 3 3400 heads outflow stage 3 3500 heads? I don't know if I should start another thread regarding that or not. Just curious.

[young gun]

Do your stage 3 3400 heads outflow stage 3 3500 heads? I don't know if I should start another thread regarding that or not. Just curious.

I'm curious... I'm still debating the idea of building either a LX9 or a LA1

[SappySE107]

http://wot-tech.com/shop/gm-60v6/sta.../prod_415.html

"The real story is the intake side, which aside from the new port shape, has highly modified runner and bowl area. This radical change in design is what puts these heads at the top of the flow list for 2.8, 3.1, 3100, 3400, and 3500 LX9 engines."

Ill add to it here with a picture.

3400 vs 3500 intake (Medium).jpg

Unless you are making custom lower intake manifold gaskets and designing a new lower intake runner, stage 3 3400 with matching components are the best flowing top end you can get for a 2.8-3.5 LX9.

[Superdave]

What's the change in the intake port CC's?

[1QUICKHATCH]

What gaskets do you use to match up with that port shape? And do you have to use a 3400 lower for those heads?

[3400-95-Modified]

http://wot-tech.com/shop/gm-60v6/sta.../prod_415.html

"The real story is the intake side, which aside from the new port shape, has highly modified runner and bowl area. This radical change in design is what puts these heads at the top of the flow list for 2.8, 3.1, 3100, 3400, and 3500 LX9 engines."

Ill add to it here with a picture.

[ATTACH=CONFIG]7906[/ATTACH]

Unless you are making custom lower intake manifold gaskets and designing a new lower intake runner, stage 3 3400 with matching components are the best flowing top end you can get for a 2.8-3.5 LX9.

Reason you don't or can't do this with 3500 heads/intakes? Just not worth it because you've already done it with the 3400 stuff? or something preventing it on that casting only?

[Superdave]

3500 intake port is already pretty close to the gasket, I always opened them up to it but it's not much. The GM gaskets were slightly larger than the Felpro as well.

[3400-95-Modified]

3500 intake port is already pretty close to the gasket, I always opened them up to it but it's not much. The GM gaskets were slightly larger than the Felpro as well.

Exactly what I did to mine, but according to his image the 3400 LA1 port that he ends up with is larger than a 3500 port.... so what gaskets is that engine running?

[carbon]

Exactly what I did to mine, but according to his image the 3400 LA1 port that he ends up with is larger than a 3500 port.... so what gaskets is that engine running?

Gen IV?

[caffeine]

Gen IV gaskets wouldn't have an opening for the coolant ports if they would even be remotely close to lining up.

[carbon]

Gen IV gaskets wouldn't have an opening for the coolant ports if they would even be remotely close to lining up.

Well then I got nothin... which is no surprise.

[SappySE107]

3400 v 3400 v 3500 (Medium).jpg

We don't end up with these shapes for the 3400 ports. It was just to show the amount of space we have to work with between the gasket sizes.

You cannot run plastic gaskets with our stage 3 ported 3400 heads.

New pic has the old trace, so 3 traces total.

Trace #1 is 3500 gasket vs metal 3400 gasket.
Trace #2 is 3500 gasket vs plastic 3400 gasket.
Trace #3 is 3400 plastic, 3500, 3400 metal.

The gasket size is practically the same as flow potential in this case, because it also limits the size of the lower intake path around the injector boss. The 3500 raised intake port certainly improves the flow curve, but its also closer to optimal to start with. The 3400 has a lot of material that can be removed to improve flow. There are also areas that do not improve or hurt flow, which is why we do not gasket match with either gasket.

just to be clear, Stage 1 and 2 3400 use the plastic gasket size port, so any gasket works. Stage 3 is metal gasket only. Currently, all our lower intakes are plastic gasket size ports to the head unless stage 3 heads are ordered. Then they are matched to the metal gasket.

Ill CC a head once I finish some other tasks. We had the CC specs for the different heads somewhere, but I don't know where anymore. Found stock at leastl

[Superdave]

Ben's pics had me interested (since i'm cleaning out my garage this week mostly). I found my stash of gaskets. Traces look like mine for the most part.

Here are a couple more... 3500 VS Gen 2, Large port 3400 VS Gen 2 and 3400 VS small port 3100.

LP 3400 vs SP 3100.jpgGen 2 VS LP 3400.jpgGen2 VS 3500.jpg

[3400-95-Modified]

So the largest gain is in the 3400 Metal gasket and using 3400 Intakes properly ported to work with that... Damn, That's news to me.