PCV Valves

Part numbers are:
CV769C Left Hand side
CV913C Right Hand side


And the reason for two PCV valves from Graham Behan:

"Well as in most of the stories from the early days of development it is
a long'ish one. Yes the system is the way it is based partially on cost. The
fresh air recirculation type of system utilizing PCV'S was the way that most
GM products were and the way that the LT5 was specified. The problems with
this were that with the LT5'S relatively high output coupled with the lack
of internal crankcase volume the requirements for the PCV system was very
different from the norm . The engine exhibits very different characteristics
at part load/no load than it does at WOT, this is true of most engines but
the massive blowby at no load required a very different PCV characteristic
than the WOT condition. During the development process Allan Nobbs, of
Lotus, came up with a variable orifice PCV valve which was well suited to
the large changes in the engine. Well after the design was shown at one of
our many vendor meetings it was decided that tooling a completely different
valve was not on, so the system was changed to the current spec, using two
valves with differing characteristics in an attempt to establish a good
compromise. We can all see the results, the system actually exhibits reverse
flow at WOT."