Vg33e Pcv valve thread pitch

It's 1/4" BSPT (British Standard Pipe Taper). I lot of people say it's 1/4" NPT, but it's not; they are very close. 1/4" BSP is 19 threads per inch and 1/4" is 18 threads per inch.

I think it's 17mm. I usually just get the PCV hose from Nissan if I need one.

5/8" would be about 1mm smaller; it should stretch over it.