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Old 03-03-2015, 08:06 PM   #6
rheltzel
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Join Date: Jul 2013
Location: Sacramento, CA
Posts: 368
Default Re: Modern Aluminum head question

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Having struggled through Chem 1A in college, I'm no chemist, but I think rockfla is correct: electrolysis happens. Rather than trying to delay its effects with various coatings such as anti-seize, which won't change the basic chemistry involved, the better approach seems to me to be to use sacrificial zinc, as is standard in the marine and aeronautical industries.

I have NOS Canadian heads on my new engine. I ordered a zinc probe that goes in one of the temp probe holes on one of the heads. It's been in place about two months so far and I haven't checked it to see if it's working. My plan is to check it after 6 months to see if it's working. The following picture shows it on the right side of the radiator outlet.

I'll report my findings in a few months.

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