It seems him and Tracy agree that we need a thicker core, then the 1" Paul L kept on suggesting. My coolant rad is almost as wide as the plane with the 1" truck core.  

I'm definitely not happy with my cooling setup, but needed to get moving and finish the plane. Can sit around all day talking about it, or start with something and get better in time. I'm done the flyoff hours in FL and hoping to bring the plane back to Canada in the spring where I can tinker with it then. 3D draw things out and get suggestions from people then.

What do you guys think of a belly mount coolant rad? How would we plum the exhaust out of the way? Keep oil coolant in the cowl? Or Below the engine?