Just guessing here, but I would think that 300hp would'nt be unreasonable. They will rev! I'm thinking that some cylinder head port work, custom reground cam (no new ones that I'm aware of), exhaust header (again, a custom piece) and maybe play around with the intake. I have a couple of these engines, in pieces on the shelf. I'm going to build one for a hot rod sometime in the future. They are light too, I think they weigh around 400# complete. They were really ahead of their time. They sound great at full wail!
It's not NASA you dolt! It's NACA!
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