Ok, here is the next question.
     
     I had my cylinder head refurbished four years ago. Last October one of 
     the valve seats gave way. When I took it off the car. there was 
     evidence of severe corrosion and the guy at the local head shop told 
     me it appears to be electrolysis. Does anyone know what causes this?
     
     Chris Stephenson
     Alpine III
     Atlanta, GA
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