Heater hose routing

It may be "less likely" to become air bound one way or the other is my educated guess.

I too never knew there was a difference when both are 5/8"
Mine are both 5/8" and I ran them parallel for looks, the heater doesn't care . Mabe a thot about forcing trapped air out the top tho.
I`m thinkin of re routing mine under the victor in take and strapping it to the underside of the runners for the winter, doesn't like to run right till it hits 190-195 .
---------------OPINIONS ???????????