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Damian,
I'm afraid I'm well away from the car presently so I can't offer precise info, but despite the fact that the Fram and Bosch parts catalogs claim that there is no PCV valve for b-18/20's, I dug up one that functions by bringing in the dead one and matching the openings on either end with ones off the shelf. I later learned that Buick from roughly 1965-1973 used an identical valve in their 455 cid's. That would be in the catalogs, I imagine. Can't recall where I dug that bit up either, so credit can go to _____ and I'll take the blame in the meantime, wrong or right.
Good luck,
-Sean Custer
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