Pouring a 2T mix down one side isn't a cast iron test, but it will often show a failed seal.

Be aware though that sometimes the seal may leak one way more than the other, may leak under a little pressure, or won't leak at all with a little pressure! Hence why it's not a great test. Just to confuse matters, even a serviceable seal can leak using this test!
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Andy.
NSR-WORLD.COM

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