Bill, The coolant passage is formed by a sand core inserted inside the mold of the casting before the molten metal is poured into the mold. Sometimes wires or small rods are used to provide extra strength to the core to prevent warpage or broken cores during the casting process. Occasionally they don't get removed when the spent core is removed from the casting. That's probably what you've found...Brian Bill Maurits wrote: > > I was ulling my extra poly aparo today and when I got the intake off, > it looks like there is a wire running through the coolant jacket of > each head. What in the world is this? '64 Belvedere Davenport, Iowa "The difference between ordinary and extraordinary is that little extra." ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html.