Last time I had to replace a head gasket, I had access to the parts washer in my college's machine shop. After I knocked the heavy crud off of the head using a few maroon scotch brite's, I put the head in the washer and did a VERY thorough flush and brush (ZEP cleaner with a stiff nylon bristle brush). I used Frank's white paper towel test to determine if it was clean.
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"Jesus didn't bring 'Natty Lite' to the party. He brought the good stuff."
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