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Originally Posted by Frank12
Because they are two the PCV Valves?
That he differs are there among them?
Which of them the is on the side of the driver?
Left hand CV769C
Right hand CV913C
When it is ideal to change?
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Frank,
Yes. There are two different PCV valves. The left one is also parted for a number of other GM vehicles. The right hand one is ZR-1 specific.
I am uncertain of service intervals. I usually replace them on my other vehicles once a year, which is most likely WAY too often. However I have been fortunate that they are always easy to been very easy to go to and very inexpensive. No reason to NOT spend the $5 to replace it once a year!
White Racing stocks all of the PCV stuff that you could possibly need, but do know that the left hand PCV valve is still available through GM. You MIGHT be able to get that part locally if there is a GM-related dealership over there.