3.5sfi inake on 3,4?

[Starglow]

If i only chande the upper. I only need gasket between the 3.4 lower and 3.5 upper. TB adaptor( for de 65mm from Oldmobile) that it's?

No...not on a stock 3400 engine. The 3500 UIM uses a different coil mounting bracket, MAP sensor, and doesn't have the same number of vacuum ports as the 3400 UIM, so you have to tap the 3500 UIM to add vacuum line connections. There are also FPR clearance issues when using the 3400 fuel rail so you may have to grind a portion of the 3500 UIM to allow FPR clearance. Sorry guys, but putting a 3500 UIM on a 3400 is not plug-N-play despite what those who haven't actually done it themselves may think or tell you. Yes, the 3500 UIM does bolt on to the 3400 LIM, but that's where the similarities to the stock 3400 UIM end.

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[Christos05]

with this is plug n play? http://wot-tech.com/shop/gm-60v6/com.../prod_174.html

[Starglow]

with this is plug n play? http://wot-tech.com/shop/gm-60v6/com.../prod_174.html

It's a good start and takes care of some of the necessary changes, but you'd still have to modify or adapt the 3400 coil mounting bracket in addition to the MAP sensor. The 3500 MAP sensor requires an adapter cable to connect it to the 3400 engine harness MAP connector. Using the 3400 MAP would require a vacuum port the 3500 UIM doesn't have in addition to the MAP mount being different.

[Starglow]

Mike @ Milzy Motorsports has an adapter kit for the 3400 coil bracket as well as the MAP sensor harness adapter. I'm not sure that spending a few hundred dollars just for a 3500 UIM swap alone would be worth any small performance gains versus doing a 3500 top swap or complete 3500 engine swap though.

[Christos05]

I think only do the top swap.. too much cash for noting. i think i'll only change de TB. I'll take the TB adaptor and if one day i want to do the total swap its the same Adaptor...

[bob442]

there ya go....