Water cooled head

[Mark O'Malley]

I have an unknown brand mono hull with a nitro engine in it. Originally had a novarossi .21 engine that had mo compression when I acquired the boat. I got ahold of a brand new Losi Mach 427 engine out of a 1/8 scale buggy. Being a car engine, it it air cooled. I'm looking to make a water cooled head for it since I have access to a lathe and milling machine as well as the aluminum needed to make the part. I wanted to get some suggestions on how to make the head or even some pictures of other water cooled heads for nitro engines. The novarossi engine has a water cooled head and the bolt pattern is the same, however the OD is smaller than what I Need for the new engine. I've seen a few designs, some being 2 piece and orders being 1 piece. Thanks again for any suggestions.