Yeah, tested right at the radiator neck. Aside from the mystery heating up issue, it runs perfectly. No white smoke, smooth idle, great power. The fact that is runs so well is the main reason I didn't question the test results when I did the early testing for a head gasket issue and everything showed the gaskets as fine.Hey, sorry to hear. Sounds like that's it. Just out of curiosity, how did you do the block test -- directly from the radiator I suppose? And did you ever see any other symptoms -- loss of coolant, lack of power, etc?