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Originally Posted by fesler
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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Your Merc is Awesome. Thanks for the pictures. I was thinking a Turbo might be easier because you wouldn't need to mess with a special intake. Maybe something like a STS system. I know a lot of people don't like them, but for a older less supported engine like the Nailhead, it might be an easy was to make some good HP. Stock the 425 made 360 hp and 465 ft pounds of Torque @ 2800 rpm.