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YES, it's part of the casting process. Nothing to worry about.
The steel sleeve is laid into the mold prior to introducing the aluminum. The exposed area is where the sleeve rests in the mold.
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Aaron.  F.S. 1965 Solex engine w carbs/cleaner
Burnham Performance
https://www.instagram.com/burnhamperformance/
Last edited by BURN-BROS; 06-13-2010 at 08:59 AM..
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