I got a solution for the next go fast V-20

[spareparts]

If you are going to spend any money on a hot engine. You may want to consider a closed cooling system, even in a fresh water enviorment. You'd be suprised the amount of electrolysis you will find in an aluminum intake on a freash water boat, let alone the heads. Biggest advantage is you have a more even temperature across the engine, rather than hot and cool spots that you would see in a raw water cooled engine