Stovebolt.com Forums The Shop Area The Engine Shop NOS GM PCV Valve

I’ve been wanting to install a PCV system on my ‘59 235 for several years now. Couple of years back, I purchased a NOS PCV riser to replace the down draft tube. I need the PCV valve that screws into that riser and is listed as GM part #1544935. I can’t find a cross reference to that number. I did a search on PCV system on this site but seem to go down a rabbit hole.

I found a valve that physically would work on ebay, but want to confirm it will work before I spend 35 dollars on something that may or may not work.

Here is a link to the valve I’m looking at. https://www.ebay.com/itm/1447013202...r=&widget_ver=artemis&media=COPY

That looks like it. I don't know why you didn't find the info on this site. e.g.

https://www.stovebolt.com/ubbthreads/ubbthreads.php/topics/942997/1.html

https://www.stovebolt.com/ubbthreads/ubbthreads.php/topics/1422635/235-stand-pipe-pcv.html

Gord, I found both of those threads, in fact I posted info to one, but I can’t find the cross reference to the GM part #1144935.

I do agree that the eBay item I posted does look correct, but was hoping for a direct cross reference or somebody that actually installed one to say “you need this AC part number…” and it works! Thanks for your suggestions!

Hopefully I’ll get some more input!

Phil,

Take a look at this previous thread on the subject.

Member "bouymaker" provided some detailed original and replacement GM part numbers along with the corresponding "AC Catalog" information in his reply post.

I just did a quick check on eBay and saw several NOS GM# 5647228 items being offered for sale.

Hope this helps out.

Dan

Perfect! That is the confirmation I was hoping for. I went ahead and ordered it.

Thanks Dan and Gord for your help!

GM parts wiki says that 1544935 was replaced by 5647228.

That's what the eBay listing says the part for sale is.

Best if it looks like & fits like the original, but that does not determine how it works.
There are only 3 important data points:
1. high vacuum orifice (cruising, light throttle)
2. low vacuum orifice (big throttle opening)
3. internal spring which sees engine vacuum and moves the internal restrictor cone to select 1. or 2.

If the engine is stock, a PCV from a very similar engine (size, power, tune) may work well.
If the engine has a big cam, the stock PCV will not work as intended.

I purchased a PCV valve sold as P/N 5647228, CV-469C a while back. It came in a silver and orange foil package. The valve was black with PAT. 32633699 stamped on it. Both ends were a correct fit, the air flow direction is correct and it has a similar spring-loaded plunger as the original AC 1544935 valve I have. The main difference is the 1544935 has a hole through the center of the cone shaped spring-loaded plunger. Air will moves in both directions; the volume of air will be varied by the movement of the cone. Perhaps PCV technology improved the design of the replacement valve.

Does anyone know what kinds of threads the 5647228 has? Looks like maybe pipe thread on one end and flare on the other?

It’s 1/4” NPT pipe on the end that screws into the PCV riser (I have the riser) and the other I suspect an inverted flare fitting.