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Old 06-20-2016, 08:32 PM   #10
Tom Wesenberg
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Join Date: May 2010
Location: Mpls, MN
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Default Re: Is this a crack ?

If you always use antifreeze I'd guess you have a scratch in the paint.
If you are a water only user, I'd not only worry about a crack, but also the circulating rust.
I also see horizontal cracks on blocks, and don't ever recall a vertical crack.
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