You've seen the treasured motorhome 440 before, but not like this! We explore the myriad gains you can find on a sickly, pathetic, low-compression 440 in three stages: first, by plumbing up a turbo; then with a set of too-trick-for-this-engine TFS cylinder heads; and finally with some turbo boost pushing through those heads.

The show’s own verdict is on its page.