Peter's post implies what I was thinking. Your symptom (water in the oil) is in direct conflict with a successful cooling system pressure test which raises questions about the test. In addition to his question about inclusion of the manifold in the test, what about the pump? Was it included?
The intermittent nature of the symptom may be in play here or in other words, I'm wondering if engine temperature might be a factor.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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