Today's experiment was for baffling. For a quick test I made it out of depron which doesn't deform until above 300F degrees. Instead of just blocking the airflow inbetween the cylinders, I added triangular pieces to deflect more and smoother airflow. This worked very well. Temperatures were stabilized for over 3 minutes with the top cylinder the hotest at 245F degrees.
Tomorrow I'll run it mounted 90 degrees rotated, on it's side. I want to see if the current top hotting running cylinder runs cooler in this orientation.
BTW, the cowling is a cut out oil drain pan from Walmart.