Some racers reported needing to use vacuum pumps on both NA and superchaged motors depending on how nasty the NA motors were. There was a very long posting over at PY about PCV systems (that was in the title) that was really interesting. If I remember right, it was from 2001 or so.
While this was my builders first attempt at a BOP seal, he was well versed in modifying the Caddy neoprene seal for Pontiac motors before that. I made sure he had the instructions. As his engines were always the top finishers at all the local races and all the car guys in town raved about him, I pretty confident he did a good job putting the seal in.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI