So I’m cleaning up the passenger side of the engine compartment. New hoses and rust prevention. This little stub pipe that comes out of the head and over to the heater core line on the fire wall. Does anyone have a good reason/idea why it’s 1/4 I’d on one end and 3/8 I’d on the other? In my mind there is enough meat to drill this out to 3/8 to increase flow. Thoughts. Pics attached.