PCV valve 5649561
I have read the posts for this valve in the archives and am still confused as to the correct valve for a 62 built mid June 62. Has anyone ever seen a 5649561 valve? What is its configuration (cleanable?) and does it have a CV-xxx number. Thanks
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Re: PCV valve 5649561
Don------
Here's a GM #5646178[not for sale]. However, that's not the number stamped on the valve. The stamped number is 1552720. I believe this valve can be disassembled for cleaning (most valves of this era were so-designed). The Delco number is CV-202.
Last edited by Joe L.; January 8, 2018, 12:29 AM.In Appreciation of John Hinckley -
Re: PCV valve 5649561
Joe, I appreciate your reply and photos. I have the same valves that you have. Both 1552729 and 5646178. I realize that there is a lot of uncertainly as to the correct valve per NCRS, but that leads me to believe that if there is no identified and labeled 5649561 there will never be a full point score for this part of judging. If I am not correct, please let me know. thanksComment
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Re: PCV valve 5649561
Don------
I corrected my previous response. The PCV valve I pictured is not a GM #5649561. Try as I may, I can't come up with anything on that part number. If it was ever available in SERVICE under that part number, it was never cataloged for a Chevrolet application.
By the way, the 5649561 part number, if it ever existed, implies a part number released well after 1962.In Appreciation of John HinckleyComment
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Re: PCV valve 5649561
Joe,
Does that change your mind about it not being for sale?Comment
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In Appreciation of John HinckleyComment
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Re: PCV valve 5649561
It's all going in the Joe Lucia Memorial NOS Parts Museum.
Oh, and I do recall when Joe bought this particular PCV valve.Vice-Chairman (West), Michigan Chapter NCRS
71 "deer modified" coupe
72 5-Star Bowtie / Duntov coupe. https://www.flickr.com/photos/124695...57649252735124
2008 coupe
Available stickers: Engine suffix code, exhaust tips & mufflers, shocks, AIR diverter valve broadcast code.Comment
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Re: PCV valve 5649561
I forgot the joke indicating "ha ha". My sarcasm may not have translated properly.
I know you could definitely sell admission to tour wherever you keep your cache.Comment
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Re: PCV valve 5649561
Thanks again Joe. The only place that I have seen that number is in the NCRS 6th addition manual page 182. Someone has had to verify this somehow for it to be listed as "the one" that is "correct". How is a person seeking to be CORRECT if it does not exist.Comment
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Re: PCV valve 5649561
Just soak it in carburetor cleaner. Many, many years ago HD trucks used this valve. We called it the "Donaldson" valve. I am talking years before they came into being for our cars. The big gas engines of the day (some over 500 cu. in.) had horrible blowby and would clog the valve in not many miles. We just soaked then for a little while in carb cleaner and they worked good as new. They were "expensive" back in the day, probably about $5.00
Last edited by Dick W.; January 10, 2018, 12:04 PM.Dick WhittingtonComment
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Re: PCV valve 5649561
Have you tried Joe Sokoloski who advertises in the Driveline?Comment
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Re: PCV valve 5649561
John, I have not. thanks, DonComment
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Re: PCV valve 5649561
Here is my thought on this after going through exhaustive searches.... valve 1552729 (CV-202) was changed to 5646178 (CV-202) and is the same valve. SO I believe that 5649561 (CV-xxx) is the same valve again with a new number that NO ONE can find or identify. End of search.Comment
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Re: PCV valve 5649561
Don------
This is a very complicated situation. GM #1552729 was first used on some 1956 Chevrolet series 4 trucks with V-8 and positive crankcase ventilation. It was discontinued in May, 1962 and replaced by GM #5646178. However, I have 3 NOS examples of the GM #5646178 and each of them is stamped GM #1552729. So, while the SERVICE part number changed, the actual valve in the box did not change (although sometime in its life the finish changed from black phosphate/oxide to zinc/cad). All of my valves (2 black, 1 zinc/cad) are labeled CV-202.
GM says that the 5646178 was used for all 1962's, including Corvette with 283 and PCV. Of course, no 1962 Corvettes were ever built with a 283. So, does this mean some/all 1962 Corvettes with 327 also used the valve stamped 1552729? According to the late, great Dale Pearman, 1962 Corvette afficionado extraordinaire, they did.
The GM #5646178 was discontinued from SERVICE in May, 1966 and replaced by GM #6421785, aka AC CV-693C. The latter is a non-serviceable, "crimped" type valve. The GM #6421785 was discontinued without GM supersession in 1981. However, Delco and GM SERVICED the valve with the GM #6421934, aka AC CV-590C, also a similar "crimped" type valve.
As I mentioned previously, I can find no reference, at all, for a valve of GM #5649561, if it ever existed it was either a PRODUCTION-only part number or it was a part number for an AC-manufactured component never cataloged for a Chevrolet passenger car.
Crimped type valves generally do not have a GM part number stamped on them, only the AC part number (i.e. CV-xxxx), The early machined body, serviceable type valves may have only the GM part number OR only the the AC part number but not both that I have ever observed. If only the GM part number, the AC part number is usually attached with a label (e.g. round disc, circumferential label, etc.). There may be exceptions, but this is what I have generally observed.
Now, for even more confusion. GM says that all 1962 Chevrolet with 327 and PCV used valve GM #5649689, aka AC CV-590 (NOT CV-590C). This valve was discontinued in January, 1966 and replaced by the GM #6421934, aka AC CV-590C. The 5649689 is a machined type valve body whereas the 6421934 is a stamped steel body. I have never seen a GM part number stamped on CV-590 or CV-590C.
So, something I'm very curious about is this: what does it say in the 1962 AIM for the PCV valve used with option 242 (I don't currently have a 1962 AIM)?In Appreciation of John HinckleyComment
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