Installed LS6/LS2 valve springs on '01+ 3400

[TurboGt]

Well I finaly got the chance to order and install my new valve springs on my '02 3400.

I ordered the springs form Lingenfelter for $65 + $15 for shipping.
GM part number: 12586484

http://www.lingenfelter.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=12586484&Category_Code=

I ordered the shims from comp cams $8 + $6 shipping
Comp cams part number: 4737-16

http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=PROD&Store_Code=CC&Product_Code=4737-16&Category_Code=

The valve stem seals were off a '92 cavalier with a 2.2 and I got them at AutoZone. $15 each
FelPro part numer: SS 10816

I also rented the tool to compress the valve springs at AutoZone
tool rental part number: 27040

Here is a pic of all the parts I got.


Here is a pic of me using the valve spring compressor on the car


Here is a pic with them installed


And in the end I feel with the given parts and sticker-(this is where the real power came from) that this gave me a net horse power gain of around 200 hp, so tha puts me at around 450 whp.

[Rhedalert]

the bottom of the spring stays put with the flat shims? I've run this setup on my '01 3400 for about half a year now, used the shims/seats from isky cams. I also went with valve seals from a Chrysler 318 and have been good. I wonder if either has an advantge or not!

[Syn]

looks good, time to change the oil lol

moonwell also used the 2.2 seals

[TurboGt]

I have heard of people saying that they had problems with the 318 valve stem seals leaking.

Actually the oil was very clean, the flash must have make it look dark.

[Rhedalert]

Hopefully not. They went onto the stem pretty snug, if anything more snug than 3.1's fit on the '00 and down heads. I'll keep an eye out though.

[Syn]

i'm running 3.1's no prob on 00 heads

[Superdave]

i used the 2.2 seals on mine, they worked great.


Nice work!

[project90tempest]

And what about pre-2000 heads ('99 to be exact)? Would you use the 2.2 seals or 3.1s?

[Syn]

are the pre 00 heads still 3400 heads?

[project90tempest]

are the pre 00 heads still 3400 heads?

Yup. My 3400 is out of a '99 Grand AM GT.

[prophiseer]

yeah, it's a pain though, if you don't know the application they came from; i.e. I've got 2 sets of heads at the shop, one from a '99GA and the other set from a '00 Malibu - both heads have the same exact friggin p/n cast on 'em; but the valve guides are different diameters. I had to whip out the number punches and mark the year on 'em.

[Rhedalert]

I have a spare set of '99 heads that took the 3.1 seals.

[Syn]

should be the same as the 00 heads, all you gotta know is the valve guide diameter

[AaronGTR]

Exactly. The heads are the same. They just changed the valve guide diameter mid-year 2000. That will determine which seal you need and if you need to mod the shims or not.

[project90tempest]

I have a spare set of '99 heads that took the 3.1 seals.

Did they need any modification? Because I think I had read somewhere on another forum that pre-2000 would use the 3.1 seals.

I just wanted to make sure and hear everyone's insight. Anyone know a part# for the 3.1 seals?