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Hi Everyone, I have a question about my zincs in the HX's on my GM 350 crusaders (1988ish). I need to know what size zincs to put back, the old were gone when I pulled the plugs, only green corrosions was left. I bought the boat last year, 1978 F32 sedan 321, so I don't know when they were ever changed before. I have some zincs that thread into the plug but do not fit into the hole in the tank. The shaft of the zinc is 1/2" in diameter, the threads are 3/8". The plug itself uses a 11/16" wrench. I 've been cleaning out the holes and they're getting larger but I'm afraid of taking out metal instead of corrosion. Should this 1/2" zinc fit in the heat exchanger? Or do I need to go to a thinner one?
Remove the end plate on the exchanger and clean out the old zinc. If needed run a tap in the hole to clean up the threads. (can get a tap loaner from auto store).
