Had the same problem with the 402 in my El Camino. Replaced the PCV with the correct one and the leakage stopped.
Apparently the PCV for the BBC found in local auto stores is a generic version. After hunting down the correct Delco number I found a few on eBay. Some people wanted over $50 for one since it also fits a "Corvette" BB. After waiting a few weeks a reasonably priced one popped up for about $12.
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Ed
1968 GTO (Thanks Mom)
2006 Silverado
2015 Chevy Express 
2024 Cadillac LYRIQ
Last edited by OG68; 05-28-2019 at 04:31 PM.
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