Original CV691C PCV Valve Pics?

[Larry T.]

I asked this question many years ago on this forum but did not get any response. I thought I would try again.

The 1966 JG calls for a PCV valve with an orange paper label with white printing identifying the correct PCV valve. I am looking for a photo of a known original PCV valve for a 1966 L72 car. Preferably a November or before car. They had 691C and 736C valves around this time. Which is correct and was there ever actually an orange paper label on a CV691 valve?

[Ray G.]

Re: Original CV691C PCV Valve Pics?


Hello;
Don't know if this helps.
I believe it is a picture I received from a friend when I had a 1966 425hp Corvette.
Ray

[Greg W.]

Re: Original CV691C PCV Valve Pics?

Larry, I had the same ? I think the L36 had the 691 valve not sure if the L72 had the 691or the 736. I never found a pic of the 691 valve with a orange paper label, but did find one with a white label. The 736 had the orange label. Some with a original L36 should know. Also never have fould alabel for a 691 for sale or I missed it.
Greg

[Larry T.]

Re: Original CV691C PCV Valve Pics?

This is the only CV691C PCV valve I have ever seen with a paper tag, on or off of a car. This is a service part and has the box with it. I am certain the tag was not added because the material is the same as the material on any other PCV valves with tags that I have handled (it is a unique composition). Obviously this is not an orange tag as the JG calls for. I am trying to find out if the CV691C ever had an orange tag, whether or not the CV691C was ever installed on vehicles from the factory and whether or not they had the tag when they did. Who wrote the JG and what do they know that the rest of us do not?

[Greg W.]

Re: Original CV691C PCV Valve Pics?

Larry, I do think from what I have researched the 691 did come on some big blocks in only 66. There is a lot of info I found in past old posts on this but took some time to find. I also have never seen a orange tag on this pcv. The 736 yes . Let me know what you find. Also never got hit at a chapter or a regional for this only at Bloomington did it get brought up.
Greg

[Matt L.]

Re: Original CV691C PCV Valve Pics?

Hello,
These are from my 66 425 Bowtie i used to own. I hope these are helpful. Note the 736 vs 691 tag. I've read somewhere there was a changeover sometime in 66 production.This is a mid April car. Perhaps someone more knowledgable can comment.
take care,
Matt Lewis