Seventy years after they were delivered to the United States Army, over 150 P-51 Mustangs are still flying. To keep these aircraft airworthy requires meticulous maintenance and dependably built Merlin engines. Among the handful of Merlin engine shops, Roush Aviation stands out as the industry leader in the design and manufacture of replacement parts, as well as a pre-eminent engine builder. Warbird Digest was given special access to the Michigan-based shop and a private interview with the legendary Jack Roush.
