2001 venture 3400 to 3900 possiblity

[b1jetmech]

The local junk yard here is having their version of Black Friday sales...everything half off! So an engine out the door will be $150 dollars plus tax.

There's a 3900 there out of an 08' Buick van.

I'm having Tim Allen ideals of modifying the wife's van for more power "grunt....grunt"

A 3900 will swap out in place of a 3400 and I would run a 3500 intake with the 3400 ECM that's already in the van.

I would go as far as swapping out the 3900's cam for the 3400's to keep the factory 3400 accessories.

Would the ECM require tuning to accommodate the increased displacement?

[carbon]

It's not a direct swap.

The cams are not compatible. The stock 3400 PCM cannot control the VVT on the 3900 nor can it control the stock ignition. The 3900 is a whole generation newer than the 3400, it's not the same as swapping in an LX9 3500.

[b1jetmech]

So the 3400 cam will NOT fit in the 3900?

The 3400's PCM would be tuned to accommodate the 3900. I fit tested the 3500 intake and it doesn't fit the 3900 lower intake. Oh well.

[pocket-rocket]

So the 3400 cam will NOT fit in the 3900?

Not directly, but cam spacers were made by TCE to fit a standard 3x00 cam in a VVT block. However, Marc of TCE is having health issues and is not producing anything right now to my knowledge.

Sent from my HTC One X using Tapatalk

[b1jetmech]

Roger that!