MattinEugene » I have a 73 145 (B20F). When I got it the exhaust was pretty well shot, so I had a muffler shop put on a new exhaust. It sounds like a farm tractor. I believe originally they had two mufflers (and a resonator?). I’ve had a different muffler put on, and it still sounds terrible. […]
When we were near town and stopped for a light the engine was shaking badly. Acceleration was slow with lots of exhaust noise. Checked compression the next day. All were 180 dry except #2 which was 0!