The official 3500 thread. pics.

[v6h.o.]

Valve sizes are the same as a 3400.

[Guest]

Hey Colin is it possible to get some better shots of the chambers in the 3500 heads? Its hard to tell how much volume is there with allt he carbon.

its hard for me to tell if they have more volume then a 3400 head. Maybe you could fill me/us in.

Thanks

[v6h.o.]

Yeah I'll try and do that sometime Shaun.

[mcgavinz26]

I think my monitor screen is too dark. I'm looking at the exhaust gasket on the exhaust port and I can't tell if the port is smaller on the 3500 than the 3400 gasket, or the other way around. If the manifold from the 3500 is a bit smaller than the 3400, thats a pretty easy fix. I'd appreciate someone setting me right on this, thanks.

[v6h.o.]

I think my monitor screen is too dark. I'm looking at the exhaust gasket on the exhaust port and I can't tell if the port is smaller on the 3500 than the 3400 gasket, or the other way around. If the manifold from the 3500 is a bit smaller than the 3400, thats a pretty easy fix. I'd appreciate someone setting me right on this, thanks.

The exhaust port on the 3500 is the same as the 3400 in size. When they changed up the new manifolds and did the heads they changed the bolt hole spacing on the 3500 compared to the 3400, The pic I was trying to show the difference in lining up.

However it also looks desieving as the 3500 exh port sizes on the manifolds is one big mother fucking port size, Thus why the excessive blackness around hte port hole. Which could make the port look smaller than it is.

Everyones monitors must be darker than mine as I see all the pic's clear for the head and chambers even with the carbon on there.

Again I'll try and get a head cleaned up at work this week sometime and take some pics of it then for everyone to see more clearly. sorry bout that.

[onefastV6]

So in all reality if one were to have their heads ported and polished the 3500 heads do not have any advantage over the 3400 heads? Would you say that this statement would be correct?

[Fierobsessed]

Has any one noticed that the "new" 3500, AKA the LZ4 is a 99mm bore, with a 76mm stroke? As opposed to the 94 mm bore and 84mm stroke LX9... I guess the LX9 3500 is a one or two year engine and thats it.

The 76mm stroke crank has reappeared! I thaught it was gone forever.

[bszopi]

The LZ4 is a VVT engine. Basically a smaller version of the 3900. The LX9 is just a bigger version of the 3400. There are in fact alot of differences between the 2 engines, not just the bore and stroke.

[Manitcor]

ben i keep getting conflicting info on this, do you happen to know if the 06 Montes are getting the LZ4 or the LX9? I havent seen a defenitive spec sheet.

So with the LX9 being a larger 3400 does it actually have the same casting number? Or is it an entirely different cast. For purposes of increasing displacement would you be able to go bigger with the LX9 than you could with the LA1.

Anyone come up with any ideas on possibly addressing the issue of the higer reslotion crank sensor other than just using a 3400 crank (feasible if the LX9 is just a bored LA1).

How can one tell the difference from the 2 types of 3500 by looking at them. If the LZ4 is a VVT engine then I would assume any pre 06 3500 is the LX9 yes?

[bszopi]

There is the VVT version. Easiest way to tell the difference is the plenum.

As far as the LX9 being a different casting, yes. Just look through this thread to find all the differences. It is a different beast, but shares alot more similarities with the 3400 than the LZ4 does.

[Manitcor]

the reason I asked about casting is for purposes of boring is there enough difference between the LX9 and the LA1 that you could poetentailly take more out than you could on a LA1

would the LX9 block work with a LA1 crank?

these are some things I cant really tell from the pics.

looking at a block for a rebuild and since I havent invested yet im trying to determine the best direction to go.

[96mcls]

well not so much with the engine cover on, i find the best was is just to look for the vvt thingy mo-bob on the timing cover

[torq455]

bastards!!! --GM that is