I have a 1964 Impala sport coupe. I recently had the transmission serviced and the mechanic told me that I have a good engine. He said I have one with a steel crank and the powerglide is aluminum instead of cast iron. Later that same day while I was at the local auto parts store another guys asked if he could look under the hood. I said sure and he told me I have a tonawanda engine? He said tonawanda made all the engines for the SS cars and a few went into regular Impala's. Does anyone know how to confirm whether this was the case? How can I confirm I have a tonawanda engine? There is no sticker on the valve covers. Did they have a sticker in 64? Any help would be appreciated. This is my first post and my first day as a member.