Not Ranked
Mainly for emissions. With the modern cylinder hone techniques and ring packs, you don't get any blow-by, but I never know how strict rules are where I send engines, so a $2 PCV valve and a $4 valve cover grommet is pretty standard issue. If a car were to go through an inspection in a strict state (such as CA), they would check for such systems.
Keith may not include one on his engines, but it would be up to the customer in that case to make sure everything was compliant.
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