1963 PCV Valve

[Joe L.]

Re: 1963 PCV Valve

The early label has not been seen on any car up till now that I know of.
Tony's Corvette in MD has an original car with the disc.
I have heard the 63 silver blue original conv from the 2010 national convention had the disc attached to the valve.
I have a NOS 590 valve in a 5-63 box with a disc.
If anybody has seen in person an early label on a 590 valve please speak up.
I honestly do not think the label was used on a 590 valve.
Bob

Bob------


I am virtually certain that you'd never see an original valve with the early style label unless it was NOS in-the-box. This style label is so fragile, I doubt that it would survive an engine compartment for more than a few days or a week, at most. Engine compartment heat, alone, would cause the glue used to fail.

Of course, if one sees a valve with the disc style label, one knows, for sure, that valve never also had the early style label as I'm nearly certain that both labels would never have been used together.

So, the question then becomes whether the valve with disc style label seen on original cars are actually original to the car. I kind of doubt it. Even though the car might be otherwise very original, these valves were, at the time, an often-replaced maintenance item and, usually, Corvette owners were meticulous in maintaining their cars.

As I mentioned, there had to be some reason that the PRODUCTION and SERVICE valves had different GM "long numbers". For example, the CV-590 had a PRODUCTION part number of 5649996 and a SERVICE part number of 5649689. There had to be some reason for that part number difference and the only thing I can come up with is the addition of the label. Of course, there may be some other reason I have not come up with.

[Ronald L.]

Re: 1963 PCV Valve

Joe,
I agree that in a given time period you are going to see similar construction and material usages. Time moves quickly too, the manufacturing process to make these changed rapidly to reduce the piece cost.

Then on the subject of different part numbers production to service?

The answer lies in material control and it applies to all AC SP parts that I have seen, in fact, it applies to this day to every single component needed to build any OEM's vehicle.

Production: the part was shipped in bulk pack to the assembly plants.
To ship them out of the plant, you have a rack tag that says 200 cv590 pcv valves in a "2121" standard rack.

Service: that same part goes into a small box with printing on it. That small box has a part number that was used to purchase if from the supplier that shows on the inside flap. Now a valve with a production number inside a box can't have the same part number to get it out of the plant, it has to change and that new number also has a sheet drawing documenting all this.

So, lacking a specific 590, 691 or 736 print, but having seen the details on other ACSP part prints, this is why the numbers ARE different, nothing to do with the labels. At the manufacturing point, it would be irrelevant and the operators would not necessarily know they were running parts for service.

[Joe L.]

Re: 1963 PCV Valve

Joe,
I agree that in a given time period you are going to see similar construction and material usages. Time moves quickly too, the manufacturing process to make these changed rapidly to reduce the piece cost.

Then on the subject of different part numbers production to service?

The answer lies in material control and it applies to all AC SP parts that I have seen, in fact, it applies to this day to every single component needed to build any OEM's vehicle.

Production: the part was shipped in bulk pack to the assembly plants.
To ship them out of the plant, you have a rack tag that says 200 cv590 pcv valves in a "2121" standard rack.

Service: that same part goes into a small box with printing on it. That small box has a part number that was used to purchase if from the supplier that shows on the inside flap. Now a valve with a production number inside a box can't have the same part number to get it out of the plant, it has to change and that new number also has a sheet drawing documenting all this.

So, lacking a specific 590, 691 or 736 print, but having seen the details on other ACSP part prints, this is why the numbers ARE different, nothing to do with the labels. At the manufacturing point, it would be irrelevant and the operators would not necessarily know they were running parts for service.

Ron------

It may be that this PRODUCTION versus SERVICE part number difference was something that was "idiosyncratic" to AC division parts. In fact, I have noted it on some other AC parts. However, the VAST majority of GM parts have the same part number for PRODUCTION or SERVICE and the VAST majority are delivered to the assembly plants in bins and supplied in SERVICE in a box (or other style packaging).

[Ronald L.]

Re: 1963 PCV Valve

Joe, Business model. Most AC SP parts were maintenance items so there was a specific business model, performance reporting on sales, profit, etc. The other GM service parts, hoses, spindles, bearings, etc. have longer life and different service model. AC SP sold outside, the other arts divisions could not do that.

[Bill C.]

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".

I have one of the valves identical to the one shown in Jim's first photo, and yes, overall length is 2 5/16". It was removed from an early July built 300 hp 4-sp car. I will attempt to get some clear pics of it and post them.
Bill Caldwell