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Re: Exhaust valve not holding pressure?
I had a similar problem on my 49 216. Was going up a hill then suddenly lost most power and limped home.
After making sure it had fuel to the carb and it worked and verified spark at all 6 plugs I then pulled the valve cover and observed the valves 5 & 6 weren't acting right and then noticed the rocker shaft had broken at the bolt hold down hole. Instead of the valves opening when they should the rocker arm was lifting at the break, basically shutting down two cylinders.
I picked up another rocker shaft and it's been running good since.
A compression test would have narrowed it to the dead cylinders but pulling the valve cover was quicker in my case.
Good luck
Dave
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