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6/08/23: Today I installed a PCV system on my ‘59 235. I found a genuine GM NOS PCV riser a few years back on eBay, in anticipation of installing it in the future. After obtaining a NOS AC PCV valve (replacement for the original), I proceeded to assembled the rest of the parts needed to do the installation. The only issue I had was the original tubing is 7/16 and finding the tubing and fittings was like finding hens teeth. My solution was to use 3/8” tubing and adapt it to the 7/16” inverted flare needed for the PCV valve.

A test drive proved the installation was a success. Full details on the install can be found here. https://www.stovebolt.com/ubbthread...997/re-nos-gm-pcv-valve.html#Post1503997