I am running a 140L in a Caprice with a 16-11 APC prop. The motor does not seem to like this combo. It starts to heat up in sustain vertical and such. There is plent of air blowing right on the cylinder fins and I have LOTS of exhaust area where the pipe exits. Would it be beneficial to open the cheek cowl and direct some air of the crankcase area? The head has had some work done to it by Mike McCormick out of NC. It idles forever and runs like a champ. I have not tached it as of yet, but it is turning quite a bit harder than the 120 NC I have with the same setup. The ports in the head have been cleaned up and had the sharp edges removed and polished. Would polishing the inside of the plenum around the rotor disc help any with more performance, assuming the overheating is simply due to inadequate airflow? We used to build a few mild chrysler drag engines, and its in the blood to tweak a bit more out of it!

thanks

jeff