Thread: LIM gasket - felpro or GM

Originally Posted by TLSheff

Ok, crossreferencing left me with nothing, since it only shows 1 number everything just came back as a supercharger gasket and just a basic illustration. But after some researching, google IS my friend...

GM #12574474 L32 (4) 04-05 - $41.91 ... same paperish design that we use for the L67s

NOW
GM #12584411 L32 (4) 06-07 - $42.10 ... is the alluminum design

If that's what your after, make sure you list that you want the 06+ gasket

Hang on there TL... 4474 is not the same paperish design. It's like a woven material with metal inside. Thats the one if you have the L67 type LIM that has recessed coolant port areas for the o-rings. If you have the newer design LIM (totally flat on top) then you go to the 4411. If you are putting the Gen V onto a non-originally equipped car, I say use 4411 because it's a much better gasket.

I only know..because I've done wayyyy to much stuff. Men have gotten lost in my PB account....never to be seen again.

Originally Posted by BillBoost37

Men have gotten lost in my PB account....never to be seen again.

I don't know whether to be impressed...or creeped out.

But since it's you Bill, I'll roll with it.

Billboost37
Boosted

Go for it. We'll see if you return unimpressed and unscathed...lol

Sad part is ...I think I have a picture of nearly everything related to our cars/drivetrains. Who even takes pictures anymore?

Originally Posted by BillBoost37

Hang on there TL... 4474 is not the same paperish design. It's like a woven material with metal inside. Thats the one if you have the L67 type LIM that has recessed coolant port areas for the o-rings. If you have the newer design LIM (totally flat on top) then you go to the 4411. If you are putting the Gen V onto a non-originally equipped car, I say use 4411 because it's a much better gasket.

I only know..because I've done wayyyy to much stuff. Men have gotten lost in my PB account....never to be seen again.

Dually Noted Google Info also suggested the 4474 if your going intercooled due to the design of the aluminum one, if you try to make the outlet larger you run a risk of hitting where the rubber seal is and it wont hold.
Good lord this is far more than I ever wanted to know about the GenV gaskets lol

Originally Posted by TLSheff

Dually Noted Google Info also suggested the 4474 if your going intercooled due to the design of the aluminum one, if you try to make the outlet larger you run a risk of hitting where the rubber seal is and it wont hold.
Good lord this is far more than I ever wanted to know about the GenV gaskets lol

Why stop there. 4474 has metal under the paperish looking surface. At first glance/feel I wondered if it didn't have some carbon fiberish stuff in there too. It's not paper like the Gen 3 gasket, it's not 100% metal like the 4411 gasket...it's a hybrid between them.

If you are intercooling, do yourself the biggest favor of all. Skip buying either one. Go to your local parts place and spend $5 a roll for the rubber/paper gasket roll. Buy two rolls, one for top and bottom of the IC. Toss in a tube of Permatex red gasket maker labeled 26B. Use a small ball peen hammer to make your gaskets to the exact shape/size you need then put a light bead of 26B around the pcv, SC outlet/LIM inlet and the bypass holes, lay gasket on, another bead on top, then IC, bead, gasket, bead and SC. I've yet to ever have a leak out of about 10 done this way. You should not that a large prybar is necessary to pull it apart again.

A Gen V LIM isn't necessary if you simply cut an extra 3/4'1" out of the snout end of your L67 manifold. A 96-99 Bonneville alternator can be made to work with a Gen V...

There's sooo much I've learned the hard way.

Originally Posted by BillBoost37

There's sooo much I've learned the hard way.

LOL Yes, I remember the year confused bonneville you had, a myriad of parts from the years