1992 Buick lesabre Gen 1 3800 upper intake issue.

[Endelmann]

I have a 3800 Gen 1 with an aluminum upper intake. I cannot find a gasket anywhere online. The rubber one they send doesn’t have anywhere to seat into lower intake. Here are the pictures. Any help would be great appreciated. Do I need to just use RTV gasket maker and go from there?

 

[HotZ28]

Is there not a groove in the UIM where the gasket fits?

 

[Endelmann]

No it’s just a flat surface on both the lower intake and upper intake

 

[2007LucerneCXL]

Appears from this diagram no gasket is used, the one that you have looks like it's for the early plastic plenum not the aluminum.

 

[Endelmann]

I went to Buick today. There is not a lot of information on the 3800 gen one but they pulled the diagram up and it takes a gasket maker they make.

 

[John Canon]

Good work ...
the Buick dealer has all sorts of surprises and products.