I have my fan thermostats in mine,Bebop said:I think Waffle on here also complained about the system being hard to bleed with this modification.
I think Gates has a small hose to connect the 2 ports and not have to tap them.
Edit : read this : https://www.facebook.com/notes/agearhead4life/dont-plug-the-heater-ports-on-a-lsx-water-pump-heres-why/704643956255902/
All I know is that Lori's buggy is set up with the ports tapped shut this and my Vortec is too. Both didn't have issues. So far so good.