[JohnnoK]

The GM 3.9l V6 engines have the same front cover as the 3.5 V8 with the uprated oil pump as standard fit. Cover is a straight bolt on to the V8 engine.
Then you should be good for oil pressure and volume.

 

[JohnnoK]

You mean the Buick 3800 series right?

Many T-type guys have actually installed Rover Suffix B front covers because they supposedly provide more reliable pressure.

I'm not sure what you call them over the pond, but in SA they were in a limited edition Opel Commodore V6.
Basically the same castings as the V8 but with 2 cylinders lopped off the back and iron versus ally block, cam in the valley, not the heads.
I think you guys referred to it as the odd or even fire engines?...