There were a few versions of this turbo setup.
1. Most popular or widely used is the Buick 3.8 V6 setup. It has a .42 AR. Used from 1978 or 79- 1983
2. Less common. 1980-81 Pontiac V8 301 Trans Am Turbo. Has a AR of .60.
They look very similar. The Pontiacs have the AR marked inside the 3 bolt plenum for the intake flange. Pontiacs also used a Solid pipe for the oil drain that is about 6" long.
Almost done making a adaptor to easily bolt this up to a stock intake.
