1963 PCV Valve

[David L.]

Re: 1963 PCV Valve

Tim---here's a CV-590 on a spare '63 F.I. unit that I have. It's not real clear, but it's stamped CV-590, with no "C" after the "590".

Jim,

Is the overall length about 2 5/16"?

Dave

[Jeff A.]

Re: 1963 PCV Valve

I had 2 of these 590C valves
First one one dated 02 box reads Ventilation Valve.
2nd dated 91 Reads PCV Valve

Valves inside were different lengths...

[Chuck G.]

Re: 1963 PCV Valve

Chuck, Gary,

There is one on ebay now but it looks like the longer version that's described in the archives as 2 9/16" long. If that's the correct valve I would like to try it but I am not sure. Even the Paragon repro looks like the shorter version but not sure how the repro part flows air.

Chuck, What type of valve do you usually see on other 63's?

The EBAY valve sold for about $103.00.

Chuck

[Timothy B.]

Re: 1963 PCV Valve

Chuck,

I will try Carlisle in a few weeks. Wonder who paid 103 for the valve?

[Ronald L.]

Re: 1963 PCV Valve

Sounds like I need to put that used original sitting on my desk to good use!

David,

This one came from a mechanic along with what I was really after, the BB valves for 66, you take the new one out, put the old one in the box and on the shelf. Boxes were dated 1968, but valves inside were used and older. This 590 has the original label in place, tattered, no C.

Box labeling - up to and inclusive of 1965, the boxes were with the ventilation valve printing. From 1968 (for sure) and beyond they changed to say PCV valve. I don't currently have any ACSP valves dated 66 or 67 that I know of...


Tim, that's cheap, the early BB valves easily go for 5 times that amount.

[Chuck G.]

Re: 1963 PCV Valve

Chuck,

I will try Carlisle in a few weeks. Wonder who paid 103 for the valve?

Don't know, but as I posted before, that's the first one I've ever seen for sale anywhere. I've seen zillions of 590C's.

I've gone to flea markets for decades. Went to Spring, Fall, and Corvette Carlisle for 20-25 years. Went to Hershey for decades. Went to Bloomington Gold for decades. Went to all the local fleas in Maryland like Howard County, Frederick, the Eastern Shore, etc. Now that I'm "down South", I've been to the Turkey Run at Daytona a few times, been to Moultrie, GA a few times, been to Zephyrhills a few times, been to Sumter County, etc., etc. I've picked up and put down hundreds and hundreds of PCV valves, and never found a "590".

I've also looked on EBAY, and been though many classified ads in magazines like Hemmings and the Driveline over the years too.

Good luck finding one. IF you happen to find another, remember your old buddy from back in Harford County, Maryland and pick one up for me.

Chuck

[David L.]

Re: 1963 PCV Valve

Chuck,

The only "CV590" valves that I have ever found were on junk yard 1963 Chevrolets (and possibly "early" 1964's as well) back in the 1980's. I have never seen one at a swap meet in the last 25-30 years. I still have a few of the 444040 brass elbows with the Weatherhead logo.

Dave

[Chuck G.]

Re: 1963 PCV Valve

Chuck,

The only "CV590" valves that I have ever found were on junk yard 1963 Chevrolets (and possibly "early" 1964's as well) back in the 1980's. I have never seen one at a swap meet in the last 25-30 years. I still have a few of the 444040 brass elbows with the Weatherhead logo.

Dave

Thanks for giving me a sanity check, David. I've never seen one in years of looking either.

We used to go junkyarding years ago when I lived in Maryland. Tim Barbieri will remember some of the places like Pick and John Brown's, Vince's in Abingdon, Creswell's in Nottingham, PA, Elmer's in Hagerstown, etc., etc.

I think the first nail in the coffin of the old yards was freon. Then came ground and ground water contamination from antifreeze, oil, gas, ATF, etc.

All the old yards in/around my old area were closed years ago.

Chuck

[David L.]

Re: 1963 PCV Valve

Chuck,

I have lived in southern NH (55 miles from downtown Boston) since 1973 but I always went to junk yards in western Massachusetts (60 to 80 miles away) because these yards still had vintage cars. However, several years ago all the vintage cars were crushed and I assume they went to China.

BTW, I was searching for more information about the CV590C valve on the web and found the following site:

http://books.google.com/books?id=ldMDAAAAMBAJ&pg=PA38&lpg=PA38&dq=cv590+valve&source=bl&ots=lhmla8UjJI&sig=KMREnfBSPCUqB1lTgODI69fjt7s&hl=en&ei=btwuTqzJBMTVgQeF9sWNAQ&sa=X&oi=book_result&ct=result&resnum=10&sqi=2&ved=0CEsQ6AEwCQ#v=onepage&q=cv590%20valve&f=false

Based on this there was a "CV590" and a "CV-590" PCV valve according to this Jan. 1968 article in Popular Mechanics. Does any 1963 owner using the "CV590" valve have a buzzing noise in the engine cpmpartment?

My used "black solid steel" valve is stamped "CV 590C".
My NOS "shiny stamped steel" valve in a box dated June 1968 is stamped "CV-590C".
Both measure 2 9/16" long.

Dave

[Harry S.]

Re: 1963 PCV Valve

There is a CV-590 on my 250 hp April 63 car. It was there when I got the car.

[David L.]

Re: 1963 PCV Valve

There is a CV-590 on my 250 hp April 63 car. It was there when I got the car.

Harry,

Is it stamped "CV 590" or "CV-590"? Could you also measure the overall length?

Dave

[Harry S.]

Re: 1963 PCV Valve

Just took it out for a closer look it's a CV-590C at 2 9/16 in length. A service part.

Cheers

[Joe R.]

Re: 1963 PCV Valve

OK, what is this?

CV...590C The dots are centered in the middle but my keyboard doesn't want to help.

JR

[Ronald L.]

Re: 1963 PCV Valve

Tim, Chuck, Dave,

The difference we are talking about is the presence of C or not.

From our other PCV valve threads, the C means continuous operation and without (Joe's) test box I would expect that is the issue you have with the 590C on your '63.

I also would expect that a very tuned-in driver could pick up a chatter to the 590 valve regulating flow.

The first AC SP PCV valves were all ID'd with Ventilation Valve on the box. These first valves have a black oxide exterior and are machined from solid billet of steel.

Either in late 65 or 66 these valves were zinc plated, better corrosion resistance.

In 1968 (for sure by then) the manufacturing technology was changing, the top was a solid machines piece, but the botton was a stamping. These will have the gold chromate look to them if they are NOS. That coloring dissapates over time in the engine compartment.

The final change would come quickly, by 1970 the valves are all thin sheet metal stamping.

As a side note with these parts being in service for a long time, if the part has AC Rochester or AC Delco its a late 80's/90's vintage part respectively.

I have real 691 and 736 valves that I'd love to test to show that the 1966 MY change had to do with the 691 having too much flow and pulling oil into the intake.

Are there any of these machines around and functional?

[Bob J.]

Re: 1963 PCV Valve

Tim, Chuck, Dave,

The difference we are talking about is the presence of C or not.

From our other PCV valve threads, the C means continuous operation and without (Joe's) test box I would expect that is the issue you have with the 590C on your '63.

Just curious about your description of the C.

Why wouldn't earlier 590 valves be "continious operation"?

Bob