[ReelMagic]

There is/was a big difference between Merc's and Crusaders and how they fresh water cooled their engines. Merc's typically used seawater (salt) to cool the manifolds/Elbows while Crusader used larger heat ex-changers allowing them to cool the manifolds as part of the fresh water loop as well. It's a better solution than the Merc's in that you didn't have to worry or change them as part of maintenance of the salt water loop. M2C