3900 vs 3500 intake?

[85maro]

I have a 3.4/3400 hybrid project that's sat stalled for quite a while now, and it's time I start digging back into it. I had planned to mock up my own uim out of polystyrene and do a sand casting, but I don't have acess to casting equipment anymore so it's either sheetmetal or oem. I like the look of both the 3500 and 3900 manifolds and both offer good flow, but I'm more attracted to the 3900's variable volume although that may not work great with my long term turbocharging project. Will the 3500/3900 uim bolt to a 3400 lim? I see most people using the 3500 manifold, is there some advantage there or is the variable volume feature unattractive for some reason? And does anyone have one?

[bszopi]

There are 2 types of 3500s - the one similar to the 3400 and the one similar to the 3900. Everyone using the 3500 manifold is using the one similar to the 3400. The 3900 (and similar 3500) is a totally different beast and will therefore not bolt up to the 3400 stuff.

[85maro]

How far off is the uim? Could I even consider offset drilling & port matching?

[Superdave]

anything is possible but the gen3 3500 UIM is badass