Can the engine in a 1999 Mercury Cougar be replaced with an engine from another manufacturer, i.e., Toyota, Honda, etc.?
Doubtful. You can use a 3.0 DOHC engine from a ford escape in it for much more power.
on that note, you can use the 3.0 from a Mazda 6. its a Ford 3.0 with Mazda designed heads.
anything is possible
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