Great interview. I always wanted to meet Mac McKeller at one of the shows but never got the chance. In the video he claims that there were 12 engines built for engineering. It’s hard to believe that only one survived as there have been other parts that were produced in lesser quantities and at least a few got out to the public. An example would be Ram Air V exhaust manifolds. It would be nice if a few more of these unique 421 engines were out there somewhere.
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