Engine Differences...

[Guest]

so i am confused. is there two different variations of the 3.5?

i have a 07 with the 3.5 and it has a different character in the VIN then my dad does. he has a 06 with the 3.5.

what is the difference. i looked under the hood and all i can notice is they have extended the engine cover. i am getting worse MPG than he is but i thought that it was because i tend to be heavier on the throttle than him.


i searched and i just didnt understand.

[Lmac83]

Re: Engine Differences...

2006 is a pushrod , 2007 employs variable valve timing.

The 07 3.5 has 24 more horses.

[leong6gtp]

Re: Engine Differences...

here is two 3.5l there is the lx9 which is the 3.5l non vvt. The other one is the lz4 3.5 with vvt. Its the better one of the two I guess you could say.
edit. The 07 is still a pushrod.

[dre256]

Re: Engine Differences...

Like posted above me thats about the diffrences None of the parts from the 05-06 3500 is compatiable with the 07+ 3500. I also belive the 07+ 3500 is rated at 1more MPG on the HWY I think

[cdipier2]

Re: Engine Differences...

so which is more reliable?

[ToniCipriani]

Re: Engine Differences...

2006 is a pushrod , 2007 employs variable valve timing.

The 07 3.5 has 24 more horses.

Both engine are OHVs.

The LX9 (2005-2007) is based on the old 3400, whereas the LZ4 (2007+) is based on the 3.9L.

[cdipier2]

Re: Engine Differences...

2006 is a pushrod , 2007 employs variable valve timing.

The 07 3.5 has 24 more horses.

Both engine are OHVs.

The LX9 (2005-2007) is based on the old 3400, whereas the LZ4 (2007+) is based on the 3.9L.

so my guess is that the 2007+ is more reliable. the 3400 is a crappy motor

[Guest]

Re: Engine Differences...

what is the vin letter for each motor?

[Blackrider]

Re: Engine Differences...

2006 is a pushrod , 2007 employs variable valve timing.

The 07 3.5 has 24 more horses.

Both engine are OHVs.

The LX9 (2005-2007) is based on the old 3400, whereas the LZ4 (2007+) is based on the 3.9L.

so my guess is that the 2007+ is more reliable. the 3400 is a crappy motor

Forgetting the LIM problems the 3400 is a pretty rock solid engine.

[cbusg6]

Re: Engine Differences...

According to this, the '07, '08 3.5 isn't vvt. But the '09 3.5 is??

http://media.gm.com/us/pontiac/en/produ ... index.html

[dre256]

Re: Engine Differences...

According to this, the '07, '08 3.5 isn't vvt. But the '09 3.5 is??

http://media.gm.com/us/pontiac/en/produ ... index.html

Its miss printed then. The 05-06 3500 in non VVT based off of the 3400. The 07+ 3500 is based off of the 3900 with VVT but not with off set bore of the 3900.

[thered6]

Re: Engine Differences...

so my guess is that the 2007+ is more reliable. the 3400 is a crappy motor

Forgetting the LIM problems the 3400 is a pretty rock solid engine.

Yeah the 3400 in my 02 alero has been a great motor 124K and still goin strong except the LIM replaced once lol.

[thered6]

Re: Engine Differences...

Sorry for getting

[mrslcom]

Re: Engine Differences...

According to this, the '07, '08 3.5 isn't vvt. But the '09 3.5 is??

http://media.gm.com/us/pontiac/en/produ ... index.html

Its miss printed then. The 05-06 3500 in non VVT based off of the 3400. The 07+ 3500 is based off of the 3900 with VVT but not with off set bore of the 3900.

I remembered a GM rep told me the 07+ 3.5 LZ4 V6 is VVT capable but not utilized, only the 3.9 is VVT. I think it was BS.