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To seize or not to seize?

Your #3 plug looks like it has a lot of corrosion at the top of the threads where it connects to the plug body. That's where the plugs tend to snap. Are those plugs more than 1 season old @Jgorm?
Not sure. Those came out after i bought the boat. Another theory i have is that the coolant tube leaks into #3 causing issues.
 
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