PCV valves

["Joe Costanzo" <costanzo@domain.elided>]

Binders,

While I currently have a leaky rear main seal, it was suggested to me today
that a clogged PCV valve could cause oil in the crankcase to be pushed past
the rear main.  Makes sense to me.  So I got on the phone with my local
IH-friendly parts store, but they were unable to dig up a part number for
the PCV valve.  Are these valves generic among manufacturers?  I just took a
look at mine, and it may be clogged (wishful thinking?) - I stopped short of
sucking on it.  While I don't expect a new PCV valve to cure my leak, it's
worth trying.  Does anyone have a part number, or an explanation for a PCV
rookie?  (Truck config = '79 Scout w/ 345.)

Thanks for any suggestions.

Joe Costanzo
'79 Scout II