>My F-L 90s (same design as the 135) has one pencil zinc at the foreward >end, top side, of the heat exchanger. It is held in place by a six sided >nut which threads into the top of the exchanger; Garrett, Also check the oil and transmission coolers. They may or may not have zincs. And don't forget about that generator! The zinc should be in the heat exchanger. Andy Andy & Linda Woods Grand Folly 1970 Grand Banks 36 Classic Georgetown, MD. ajwoods@worldnet.att.net