GM V6

[Geoff Richards]

Am interested in info on 3.8l V6 as fitted to Holden vehicles (Aus)
I believe they are Buick engines but do not understand the 
relationship between them and GM.
Would someone be able to enlighten me to this and what other
vehicles used this engine in the States so when reading different posts
I can understand a little better :-)
What is the GN type site referred to as read on this list?
If this is what I am lookin' for could I have the address please
Thanks
Geoff