This flange will work on all largeport 4AGEs.
They are made out of 3/8" 6061 Aluminum but special orders can also be made to your spec.
There is a counterbore for 2.25" pipe which matches the area of the intake. You can special order a flange without this if you want to use different sized piping.
Right now these flanges are made to order so please allow a couple weeks for us to machine and ship them.