Quote:
Originally Posted by ZDan
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All of Toyota’s modern engines have the cams in a cam carrier that sits on top of the head and a roller rocker valve train (which the Mazda may use; I’m not familiar with the sky active construction.) Just comparing the ZZ engine (shim buckets, cam in head) to the ZR engine (roller rocker, cam carrier), the crank center line to the top of the engine is 6” taller on the newer engine. The Miata is more of a true midship engine versus the BRZ/86 that has the engine dropped between the wheels.
The point above about the strut towers also being a limiting factor is on point, too.
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