We have done a few Nailheads but they have all been supercharged, the problem is no one makes parts for them so they are very hard to build, everything has to be custom built. It is going to cost you a fortune to build this engine to run a charger or turbo and if you need some info on where we got some of the stuff I can dig it up for you. They are great engines but no one really makes much for them. Here are some pics of the 1949 Merc we built a few years back
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