Everyone, my original description was incorrect. I apologize.
After actually touching the I.M., I determined that there is not a temperature difference of the runners.
With my exhaust cross over ports blocked on the I.M. and the engine warmed up, the temperature by touch, close to the carburetor, at idle, the runners to all cylinders is about 45*F.
I guess I got worried about something that I imagined in my mind.
Please accept my apology.
