Oh great wise builders, I'm not sure how big to make the cowl opening holes on the front of my new cowl. The old cowl was basically fully open and several things have been changed on the restoration. First off, I now have a plenum box on top of my cylinders. I have gathered some information and lots of opinions and I understand initially smaller is obviously better. I'm thinking 2 6x3 inch horizontal ovals on each side of the propeller, inline with the cylinder heads. Opinions? Comments? Concerns? Thanks again guys!
