PCV Valve(s) Replacement [Archive] - ZR-1 Net Registry Forums

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ralph92ZR1

01-17-2006, 06:28 PM

Doing some inexpensive winter-toolin around. Curiosity - from the book 1 of 2 service manuals for a 1992: there are 2 PCV valves and are not interchangeable. AC types CV746C and CV913C, however only CV913 is available and the other replaced by CV769C as per the GM dealer. My question is why 2 different sizes? Does anyone know the difference in function? Thanks...

ZR1 MK

01-18-2006, 12:51 PM

See the link below for some insight.
http://listserv.corvettemuseum.com/cgi-bin/wa.exe?A2=ind0112&L=ZR1NET&P=R52428&I=-3

ralph92ZR1

01-18-2006, 04:04 PM

See the link below for some insight.
http://listserv.corvettemuseum.com/cgi-bin/wa.exe?A2=ind0112&L=ZR1NET&P=R52428&I=-3
Thanks Mike that link helps. I would still like to understand why 2 different sizes?