Rusty,

 

On your temperature issue, I’ve been fighting a similar issue on my new cooling set up.  What I’ve discovered is that my evaporator cores are not allowing coolant to flow evenly through them.  At least at lower power levels.  Only the top ¼ is getting hot. 

 

I can't recall where your hoses entered, and exited the evap cores.  I'm assuming they enter and exit the top side?  Are they parallel, or series?  Do you have a thermostat?  Very odd that only the top portion would get hot, unless the hoses are on the top, and you have a thermostat that's limiting the flow to a trickle.   

Both feeds in & out are on top.  No thermostat – cores are series.  I’m not sure about the flow rate, but the water pump only has about 8  hours on it.  I had replaced it because the other one started leaking around the shaft, just before I took it to the airport.  I left the water pump portion attached to the housing during the engine rebuild, so it wasn’t even taken apart.

 

 

I don't think you're going to gain anything with those tubes.  As Tracy said, when you think of water flow rate, don't thing straw, think fire hose.  Water will be forced to use the whole core.     

 

I would think the same think, although I don’t know what would limit my water flow.  It doesn’t seem to me that the flow is sufficient either.  I pulled off the hose on the top of the thermostat housing, and started the engine.  At an idle it put out very little water.  Some, but not much. 

 

Any thoughts ?

 

Steve