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Technician A says aluminum cylinder head surfaces should be scraped clean only with nonmetallic tools to avoid gouging.

Technician A says aluminum cylinder head surfaces should be scraped clean only with nonmetallic tools to avoid gouging. Technician B says that aluminum heads should also be chemically cleaned accordin

Technician A says aluminum cylinder head surfaces should be scraped clean only with nonmetallic tools to avoid gouging. Technician B says that aluminum heads should also be chemically cleaned according to the manufacturer's recommendations before inspection. Who is correct?