Rebuilding my M25. I had a coolant leak that I thought was a pinhole in my exhaust manifold. After pressure testing the system it appears that I missed something on re-assembly. On the head aft of the #3 exhaust port I have a threaded hole that spews coolant under pressure (about 5 lbs) Can anyone tell me what went in that threaded port.
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Greg Perkins
Port Orchard, WA
1986 Catalina 36
Sail #528