If you just insist <G> on doing the tube thing, May I suggest the following:   Hot liquid rises, which is why we're saying it stays on top.   Why not leave the inlet alone, and put the tube only in the outlet side, so it extends within a couple inches of the bottom. 

Rusty,

Actually, the tank on the other end of both cores have a plate going across about 2” below the top of the core.  Not having seen one cut apart, my assumption was that the tube on the other end, forced the liquid to the bottom of the core, where it flow across, up, across, and out ?  I think I got dizzy just explaining that theory.

Don’t all cores have these plates ?  These are GM evaporator cores, though the size varies by a ¼” they are pretty close to the same size.  Both had the tubes on each end coming out of the top, which is why I went with these particular ones.

Steve