3.7L engine interchangeability

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2013 Mazda CX9 GT , 1999 Miata
Does anyone know what the differences are between the *A* and *V*, California vs Federal, CX9 versions? (eigth digit of the VIN number)

I had water pump bearing failure at 92k miles on 2013 CX9. Coolant thoroughly mixed with oil and pumped throughout engine. Shopping used replacement engines now.

Also has anyone tried swapping a 3.7l from a Ford or Lincoln application to a Mazda? The used Ford engine prices are a bit less than Mazda engines.

Thank you,
- wadewit
 
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2013 Mazda CX9 GT , 1999 Miata
Lincoln and Ford 3.7L duratech used engines are significantly cheaper than the CX9 salvages. But I bought a low mile (46k) 2012 CX9 engine with *V* vin. Swapping it in to my 2013...
 
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