all miata are i4. they originally came with a 1.6 then was switched to 1.8l bp in the late na models and all nb models. the nc has a duratec. the 1.8 made 130 hp and came with a forged crank from factory, its the same engine that came in escort gt. to me ford switching to the zetec was a down grade
Turbo Turtle Garage
Zetec and Duratec Turbo kits, engine building
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