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I have a 1985 Perkins 4-108 and I had the same questions years ago when the boat was new. A Perkins mechanic who worked for a first rate marina said that a zinc was not needed in my case since the heat exchanger had rubber end caps which isolated the exchanger from the metals in the rest of the engine. I've removed that heat exchanger numerous times over the past 25 years to clean the tubes and could not find any zincs. FWIW
My Westerbeke 40 (4-108, 1979) has two of them, one in the heat exchanger and one in the oil cooler,
Richard
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