If you are willing to punch the holes larger with a chassis punch, and install larger grommets, then of course larger tubes can be installed.
I'm close to doing this for the "suction" side, I have all the parts to do it. I plan to ascertain that a local radiator shop can replace the 1-3/8 outlet elbow of the Hall radiator with a 1-3/4 outlet elbow ... once that is settled the holes shall be punched larger.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.