I am just completing my FIA car (CSX7996) also. My engine builder didn't want the
oil running cool and had me install a high temperature Mocal
oil thermostat. Will probably only pass
oil thru cooler during very hot days or open track events. I just titled and registered my car and I have another easy option for you that you might explore. PM me and I will go into detail. I have the FIA Jim Inglese Weber setup and have no return line and I'm sure I won't. Call Jim Inglese and discuss if you want the expert answer. Jim Leader