Most one-off engines belong to the world of exotic supercars — think the Mercedes-AMG One and its Formula 1-derived hybrid powertrain. What you almost never see is a mainstream brand like Ford commissioning a bespoke engine for a family sedan, then keeping it exclusive to that single nameplate. Yet that is exactly what happened with the Ford Taurus SHO V6 — and it makes this unassuming four-door one of the most intriguing used-car finds hiding in plain sight.
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