What is a good head gasket to use in a 4.1 production build?

[Intercooler]

None of the 3.8 gaskets fit because of the Siamese water passages at the top. What fits and works well? Who makes them and where to get? Thanks!

 

[Intercooler]

Victor Reinz # 5957SC

That is what the archives say but no mention of where to pick them up? Anyone have a supplier?

 

[unboostedV6]

Fel Pro 1000
GB

 

[Carolinaturbot6]

Jesse, a TR club issue I have here has a listing of headgaskets & part#'s. It says:

Part# 25518453 Fel Pro Composition used on 4.1 V6,
recommended by Buick Power Source as
H.D. Turbo Replacement.*


*Editor's Note: Fel Pro does not
recommend this gasket for turbo
applications*

This probably doesn't help you much, but thought you may want to know.