3900 Vs 3500 (LX9) manifolds.

[Blackrider]

Are they the same?

[bszopi]

No. http://www.60degreev6.com/showthread...&highlight=LX9

The LZ4/LZE would have similar manifolds to the 3900, whereas the LX9 is the box-style version that fits on the 3400 lower manifold. By similar, I mean they will bolt up to a 3900 (or other VVT) engine. They are not the ram-horn style plenum, but a box-type still with a split near the end of the box. There is a picture somewhere floating around showing it.

[Superdave]

lol, even i'm confused by that ^^^



I agree, not the same. the exhaust studs are offset in the VVT engines whereas the LX9's are the traditional setup like the 3400/3100.



Now, is it possible to use 3900 manifolds on an older '660.. Probably but you'd have to have them re-drilled for the right bolt pattern. Might be worth it to someone though..

[bszopi]

There is a pic of the LZ4/LZE engine. And, I guess as far as manifolds go, are we talking intake or exhaust manifolds? I was talking intake, but Dave appears to be talking exhaust...

[SappySE107]

Damn GM and their 3.5 fetish. Makes for some confusing discussions:P

[Superdave]

Aah yes, i can see the confusion.

It would be nice if the LZE plenum would bolt to the LX9..

[Blackrider]

Yeah I answerd my own question last night, I forgot about the offset on the 3900 so they don't even line up. Thanks Brad, dumb question.

Jordie's a dumbass. lol