RE: An exhausting subject
My 120 hp Lehman's have an OD on the elbow of 3 1/2 inches. Inside diameter of the exhaust hose is therefor 3 1/2 inch. Just got a replacement as the starboard elbow developed a small drip. I guess these engines are famous for wearing though elbows. A guy I met at a marina in Sweden (Ford mechanic) told me to check them B4 any long trips. Guess he knew what he was talking about.