RE: Cowl for 4*120 ??
This is a four star 60 I just finished. You can make the same noise modification to the 120. You cut off the cheeks and build a cowl that fits perfectly to your engine. It takes a little time but its not hard and the final results turns out pretty nice? I found the instructions on how its done on the web and I believe I have a copy if you want them.
Ted