66-68 bb pcv valve tag - NCRS Discussion Boards

66-68 bb pcv valve tag

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  • Stephen L.
    Extremely Frequent Poster
    • May 31, 1984
    • 3157

    #16
    Re: 66-68 bb pcv valve tag

    Originally posted by Mark Donnally (13264)
    OK...thnx. Do the judges ever mention it?
    Mark, I'm not a judge. I'm hoping a C2 judge will respond to your question.

    Comment

    • Danny P.
      Very Frequent User
      • June 30, 2002
      • 341

      #17
      Re: 66-68 bb pcv valve tag

      Stephen, in 1967 there was two PCV used CV736C and the CV 691C state in Judging manual i don't think there ever was a label that stated CV691 if there is i would like to see a original one for a CV691 maybe someone can post one to view, by the way the CV736 and CV691 are the exactly PCV valve, that my Details ?
      Last edited by Danny P.; October 30, 2021, 11:49 AM.

      Comment

      • Danny P.
        Very Frequent User
        • June 30, 2002
        • 341

        #18
        Re: 66-68 bb pcv valve tag

        Earlier 67 build cars used the CV691 and later on CV736 were used till maybe 71-72 CV736 also came in different design and style in later years

        Comment

        • Stephen L.
          Extremely Frequent Poster
          • May 31, 1984
          • 3157

          #19
          Re: 66-68 bb pcv valve tag

          Danny,
          I don't know if this label is original or not.....PCV 691 label....... again, possibly a C2 judge can chime in..........

          By the way, there is a difference between CV691 and CV736...... a different vacuum rating...... is it significant? I don't know....
          Attached Files

          Comment

          • Danny P.
            Very Frequent User
            • June 30, 2002
            • 341

            #20
            Re: 66-68 bb pcv valve tag

            Originally posted by Stephen Lavigne (7553)
            Danny,
            I don't know if this label is original or not.....PCV 691 label....... again, possibly a C2 judge can chime in..........

            By the way, there is a difference between CV691 and CV736...... a different vacuum rating...... is it significant? I don't know....
            Yes i seen this one also its a made up Tag it's not Original for sure , don't think GM ever made a Tag for CV691 Stephen, my 67 been Judge National's many times and never a problem, GM use CV691 on 1967 the vacuum rating must of been ok for GM to use it.

            Comment

            • Stephen L.
              Extremely Frequent Poster
              • May 31, 1984
              • 3157

              #21
              Re: 66-68 bb pcv valve tag

              Originally posted by Danny Pantuso (63794)
              Yes i seen this one also its a made up Tag it's not Original for sure , don't think GM ever made a Tag for CV691 Stephen, my 67 been Judge National's many times and never a problem, GM use CV691 on 1967 the vacuum rating must of been ok for GM to use it.
              Judges don't remove the PCV valve from the valve cover during judging. Therefore they can't make the comparison. How do you know the PCV 691 label isn't original???????

              Comment

              • Danny P.
                Very Frequent User
                • June 30, 2002
                • 341

                #22
                Re: 66-68 bb pcv valve tag

                Originally posted by Stephen Lavigne (7553)
                Judges don't remove the PCV valve from the valve cover during judging. Therefore they can't make the comparison. How do you know the PCV 691 label isn't original???????

                NCRS Mechanical Judging don't pull the PCV but they know, there just looking for the proper orange and white tag and the spring clamps, but Judging ask to remove the oil Cap to see under if tabs are right , just looking at that CV691 Tag its not Original someone cut out looks like gasket paper and stamp the numbers on it, its not original.

                Comment

                • Stephen L.
                  Extremely Frequent Poster
                  • May 31, 1984
                  • 3157

                  #23
                  Re: 66-68 bb pcv valve tag

                  Danny,
                  Attached are photos of a correct PCV valve tag for #736 & #691.
                  1966 BB and early 1967 BB used a #691 valve and tag.
                  1967 BB and 1968 BB used a #736 valve and tag.

                  If your car has a #736 valve then it should have a #736 Tag. The opposite is true if you have a #691 valve. It should have a #691 Tag.
                  Your car, in an earlier post, had a mix of the 2....a #736 valve tag with a #691 valve.

                  I've also attached a portion of the 1966 Judging manual for reference. The 1967 manual has a similar statement.
                  Attached Files

                  Comment

                  • Danny P.
                    Very Frequent User
                    • June 30, 2002
                    • 341

                    #24
                    Re: 66-68 bb pcv valve tag

                    Originally posted by Stephen Lavigne (7553)
                    Danny,
                    Attached are photos of a correct PCV valve tag for #736 & #691.
                    1966 BB and early 1967 BB used a #691 valve and tag.
                    1967 BB and 1968 BB used a #736 valve and tag.

                    If your car has a #736 valve then it should have a #736 Tag. The opposite is true if you have a #691 valve. It should have a #691 Tag.
                    Your car, in an earlier post, had a mix of the 2....a #736 valve tag with a #691 valve.

                    I've also attached a portion of the 1966 Judging manual for reference. The 1967 manual has a similar statement.

                    Thanks Stephen, 1967 Judging is looking for Orange paper with white lettering says TYPE-CV-736C they don't Judge the PCV Valve, but of course you would need the the proper Label stating #691 tag if you were being Judge as a 1966, i will confirm with Mechanical judging if i would lose any points if i flip over to a 691 tag label on a 67 when being Judge , in 67 early cars came with #691 then later where #736, Danny

                    Comment

                    • Gary J.
                      Extremely Frequent Poster
                      • April 1, 1980
                      • 1241

                      #25
                      Re: 66-68 bb pcv valve tag

                      I don’t understand why the PVC valve is not judged. Ask the owner to remove it like he has to do with the air cleaner, distributor cover, etc. Not a big of a deal.

                      Comment

                      • Stephen L.
                        Extremely Frequent Poster
                        • May 31, 1984
                        • 3157

                        #26
                        Re: 66-68 bb pcv valve tag

                        If the PCV is the flat top design, maybe they assume it has the correct part number matching the tag.

                        Comment

                        • Tim S.
                          Very Frequent User
                          • May 31, 1990
                          • 704

                          #27
                          Re: 66-68 bb pcv valve tag

                          My takeaway from this thread is this tag is not original. Correct?
                          Tim

                          Attached Files

                          Comment

                          • Richard M.
                            Super Moderator
                            • August 31, 1988
                            • 11323

                            #28
                            Re: 66-68 bb pcv valve tag

                            Being bored in a Georgia campground for 3 days now, waiting until this southern Nor'easter departs, I did some research on the PCV. In the 1966 and 1967 AIMS, the part number for the PCV is identical for the 427 BB engines(L36/L72 and L36/L71). In the 1966 AIM next to the PCV part#, 6423438, there is Note 11(circled), but my digital copy of the page is poor quality and I can't see it. Maybe this was a change from the CV-691 PCV later in 1966.

                            Part# 6423438 VALVE ASSY is not shown anywhere in my online Parts Book references on gmparstwiki.

                            Maybe someone can confirm, but I suspect this part number was never available in Service.

                            I suspect the "ASSY", as referenced in the AIMs, included the label that we're discussing, and the reason that the label is never shown as a separate part# in the AIMS.

                            Service PCVs are shown under Group 1.745 in the Parts Books. E.G. HERE. The CV-736C is shown as GM Part# 6423695. Here is a file photo of a NOS example. There is no label included in the Service part, and it is not referenced as a "ASSY", simply "VALVE, VENT". Note that the NOS service parts are stamped steel, not machined as originally equipped from St Louis.

                            s-l1600.jpg

                            Just some info that may be already known by some of you, but it had me thinking ever since I tapped into this thread.

                            Rich

                            Comment

                            • Mark D.
                              Extremely Frequent Poster
                              • June 30, 1988
                              • 2151

                              #29
                              Re: 66-68 bb pcv valve tag

                              Originally posted by Tim Schuetz (17356)
                              My takeaway from this thread is this tag is not original. Correct?
                              Tim,
                              Great pics...thank you.
                              Looks like the upper rad hose and clamp(s) are replacement. We are left to determine accuracy, all these years removed. Who knows what's real? The 65-67 guys do a really good job, based on what (they) we think (they) we know.
                              Kramden
                              Kramden

                              Comment

                              • Philip A.
                                Expired
                                • September 18, 2021
                                • 94

                                #30
                                Re: 66-68 bb pcv valve tag

                                Sorry im late to the party. What about the 69 L68 pcv tag? the only one i can find is the orange with black lettering. Anyone?

                                Comment

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