K-19 smog pump identification

[Jeff S.]

Can someone with an original 327 A.I.R. car please verify the casting number(s) on the pump for me? I'm finding differences in numbering convention in reference sources as follows:

AIM - p/n 5697255 for both small & big block
4th Ed TIMJG - casting # 7800308 small block; 5696211 big block
Parts Catalog, 1980 - p/n 7800308 for both small & big block ('66 + '67)

(I'm aware that there are frequently differences in p/n & casting number & Delco numbering, etc.) I'm looking for a way to visually ID the appropriate pump. My car is a very late model with 7/13 build date. Thanks in advance.

Jeff

[Joe L.]

Re: K-19 smog pump identification

Can someone with an original 327 A.I.R. car please verify the casting number(s) on the pump for me? I'm finding differences in numbering convention in reference sources as follows:

AIM - p/n 5697255 for both small & big block
4th Ed TIMJG - casting # 7800308 small block; 5696211 big block
Parts Catalog, 1980 - p/n 7800308 for both small & big block ('66 + '67)

(I'm aware that there are frequently differences in p/n & casting number & Delco numbering, etc.) I'm looking for a way to visually ID the appropriate pump. My car is a very late model with 7/13 build date. Thanks in advance.

Jeff

Jeff-----


The 1966-67 Corvette pumps differ from those used on all other 66-67 applications in that they have a "tee" off the bottom of the aluminum housing for the outlets. All other pumps have the outlets off of the rear cover. So, if you have a pump configured as described, you should have the right one. If it has the outlets off the back of the pump, then it's NOT the right one.

[Jeff S.]

Re: K-19 smog pump identification

Joe

Are you saying that a Corvette pump has the outlet port (single, to a "T" fitting) on the pump BODY, and only the inlet port is on the pump COVER?

[Mike M.]

Re: K-19 smog pump identification

66 and 67 corvette smog pumps have a t-fitting that presses into the bottom of the body of the pump. unique pumps. mike

[Joe L.]

Re: K-19 smog pump identification

Joe

Are you saying that a Corvette pump has the outlet port (single, to a "T" fitting) on the pump BODY, and only the inlet port is on the pump COVER?

Jeff-----


Yes, only the inlet port is on the rear cover. There are two bosses on the rear cover which are unmachined for orifices and tubes, although I have seen some that were machined for orifices and had soft plugs installed. I'm not sure, though, if originally installed pumps had such plugs.

Corvette pumps had the tee fitting off the bottom of the aluminum pump housing. As far as I know, they were the only application to use this configuration although I suppose it's possible that some other GM carline used it.

[Ara G.]

Re: K-19 smog pump identification

Jeff
The T fitting on the bottom of the pump is unique to Corvettes. Also, the stamping on the front of the pump should end with the letter P. I say this, but I think there is some controversy as to wther other letters are acceptable. An example of a stamp on the front of the pump would be 02471P. This would be the 24th day of 1967, first shift and P meaning Corvette.
Mark Gorney has a tremendous amount of knowledge on smog systems, so I hope he chimes in here.
Good luck and hope this helps.
Best regards
ARA

[James G.]

Re: K-19 smog pump identification

Jeff
The T fitting on the bottom of the pump is unique to Corvettes. Also, the stamping on the front of the pump should end with the letter P. I say this, but I think there is some controversy as to wther other letters are acceptable. An example of a stamp on the front of the pump would be 02471P. This would be the 24th day of 1967, first shift and P meaning Corvette.
Mark Gorney has a tremendous amount of knowledge on smog systems, so I hope he chimes in here.
Good luck and hope this helps.
Best regards
ARA

That would make the date 1941P for the July 13 build date. I would expect 30-45 days earlier or 1641P would be close to correct

[Joe L.]

Re: K-19 smog pump identification

Jeff
The T fitting on the bottom of the pump is unique to Corvettes. Also, the stamping on the front of the pump should end with the letter P. I say this, but I think there is some controversy as to wther other letters are acceptable. An example of a stamp on the front of the pump would be 02471P. This would be the 24th day of 1967, first shift and P meaning Corvette.
Mark Gorney has a tremendous amount of knowledge on smog systems, so I hope he chimes in here.
Good luck and hope this helps.
Best regards
ARA

Ara-----


The suffixing "P" denotes the pump model. However, since I believe this model pump was unique to 66-67 Corvettes it would, essentially, also represent Corvette.

[Matthew G.]

Re: K-19 smog pump identification

Sorry, this is an old thread, but I've come into a lot more education on this subject in the last 2 years. That education has come primarily through; purchasing an original,1-owner California Car that came with the entire system in a box and also through finding and possessing several original 66-67 systems. Many of the sources of those systems had no idea what these were for and thus no reason to own restamped, fabricated pumps, etc. There is a clear difference in the physical appearance of a 66 or 67 pump as most of the folks reading this know. The "Tee" fitting is exclusive to this car during those years. However, there are also clear differences between a 66 and 67 SB system (and BB for that matter). The hoses were different between the two years, the brackets were different, even early 66 pumps were different than the majority of the 66 pumps. A plated sleeve in one of bolt channels was that difference. When you find these systems mostly original, intact, and unmolested, you can really start pressure-testing the judging guides and 'sort-out-the-truth' in the message board confusion. Here's what I've found...every REAL 66 model pump that I've encountered has an "E" ending. Some of the "E"s were large stamps and some were smaller stamped. I have plenty of pictures if you'd like to see. The "A" (or any other suffix) stamped-pumps were NOT corvette in 66. I firmly believe that. Could there have been a shift worker who incorrectly stamped the wrong suffix?....maybe...but I will always question that pump and certainly not buy it as a stand-alone pump. You'd have to show me what accompanied it before I would touch it. These other suffixes were on Camaro, Chevelle, passenger GM cars. How do I arrive at that opinion? 2 reasons; 1. The original systems I've found dispute it, and 2. Ive personally seen "A"-stamped NEW pumps (with the correct T) on a well-known restamper and fabricator's shelf. I will say no more about that. As for the 67 pump...you should be looking for a "P" suffix at the end. Every original 67 pump I've seen has this "P". Furthermore, the service replacement 66-67 pumps (many were made from 68-71)continued to have the "P" to designate the Corvette model....NOT the "E". The "E" was a 66-only Corvette suffix. It seems to be exclusive to that year. What this all tells me is that the good work that Mark Gorney and his team did putting together the 66 smog portion of the judging guide is SPOT-ON correct. He has also been an incredible source of factual information on these systems. FWIW.

[Loren L.]

Re: K-19 smog pump identification

Please excuse a short sidetrip, but any thread about '66 AIR pumps and people who actually KNOW about them must be explored. I have a pump, BELIEVED to be for my '66 El Camino (BBC, PG, A/C, PS, PB,etc) that carries an assembly stamp of 30251A; case is cast 5696211, with a casting of CFB 3 on the line below; case carries the Saginaw logo, a stylized "S' in a square with rounded sides; a cast "BT in a circle; a caution casting on two lines "DO NOT"(1st line) and "CLAMP IN VISE" (2nd line); a timing circle of 65 with 12 divisions with 4 of the divisions having varying #s of dots in them (we're talking "Pass the microscope" here); the cover is cast 5696132 and what I assume is a Julian date of 172; the cover also has what I'll call a stamping of "D 5". The 4 bolts connecting case with cover are hex head with a "shoulder", 3 marks for hardness and no logo. Do I have what I think I have?

[Joe L.]

Re: K-19 smog pump identification

Please excuse a short sidetrip, but any thread about '66 AIR pumps and people who actually KNOW about them must be explored. I have a pump, BELIEVED to be for my '66 El Camino (BBC, PG, A/C, PS, PB,etc) that carries an assembly stamp of 30251A; case is cast 5696211, with a casting of CFB 3 on the line below; case carries the Saginaw logo, a stylized "S' in a square with rounded sides; a cast "BT in a circle; a caution casting on two lines "DO NOT"(1st line) and "CLAMP IN VISE" (2nd line); a timing circle of 65 with 12 divisions with 4 of the divisions having varying #s of dots in them (we're talking "Pass the microscope" here); the cover is cast 5696132 and what I assume is a Julian date of 172; the cover also has what I'll call a stamping of "D 5". The 4 bolts connecting case with cover are hex head with a "shoulder", 3 marks for hardness and no logo. Do I have what I think I have?

Loren-------


Yes, you have what you think you have. At least, you have an AIR pump that COULD HAVE been installed on a 1966 El Camino. Of course, this same pump could have been installed on certain other 1966 applications, too. The "A" model pump (last character of the assembly date code) is the code that would have been used on a 1966 El Camino (as well as certain other 1966 applications). It was manufactured on the 302nd day of 1965. 5696211 is the casting number that would have been used for the main case of the AIR pump used for 1966 El Caminos (as well as certain other 1966 applications). The "CFB 3" on the aluminum case denotes Central Foundry-Bedford (Indiana) and the #3 mold).

The rear cast iron plate, embossed 5696132, is the correct rear plate for a 1966 El Camino (and other 1966 applications). It was cast on day 172 of some year (almost certainly 1965). The "D5" denotes the GM Danville, IL foundry and pattern #5. Most GM AIR pump backing plates were cast at Danville, IL.

[Edward V.]

^rdCC= ?
I have no reason not to believe this is not the original pump and it doesn't have an "E".

Regards, Ed

[Matthew G.]

Re: K-19 smog pump identification

^rdCC= ?
I have no reason not to believe this is not the original pump and it doesn't have an "E".

Regards, Ed

Ed, I certainly respect your thoughts. Would love to see photos of the back plate on the pump, hoses, clamps, "T" fitting location and pressure control valve location on the pump. Unfortunately....the last 2 can't be photographed with the pump installed . I ask about the non-pump related photos (hoses, clamps, etc) because they may provide clues to whether that system has been removed/replaced, etc at some point.

[Edward V.]

Re: K-19 smog pump identification

Matthew,

Give me your email address and I will send you some photos.

Regards,eD

[Matthew G.]

Re: K-19 smog pump identification

Ed,
MattdecaMBAvette@gmail.com