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Will all Z31 engine fit in a 300zx?

No, not all Z31 engines will fit in a 300ZX. While the Z31 and 300ZX are both Nissan vehicles, they have different engine bay configurations and dimensions. The Z31, which was produced from 1984 to 1989, is powered by a VG30E V6 engine, while the 300ZX, which was produced from 1990 to 2002, is powered by a VG30DE V6 engine.

The VG30DE engine in the 300ZX has several differences compared to the VG30E engine in the Z31, including:

- Different mounting points

- Different intake and exhaust manifolds

- Different electrical connections and sensors

- Different fuel injection system

- Different ignition system

Due to these differences, it is not possible to simply swap a Z31 engine into a 300ZX. Significant modifications would be required to make the engine fit and function properly. It would be more practical and straightforward to use an engine that is specifically designed for the 300ZX.