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Old 02-19-2013, 07:39:42 PM   #1
Budz
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'70 A.I.R Pump dating

I searched, but want to be sure.

Is this the correct breakdown for this date code: 07501S

075= 75th day (March 16)
0= 1970
1= shift
S= plant

Casting # on back cover: 7801149
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Old 02-19-2013, 08:18:33 PM   #2
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Buddy, I agree with your above mfg date breakdown.

It is very very difficult to read this stamping when pump is installed on the engine in the cradling bracket.

There is only one juudged show anywhere where this dating is even thought about.

I would advise anybody restoring the A.I.R. "smog" system on their Camaro
not to spend any extra money chasing a correct dated smog pump. I would
spend your money on a quality looking replated 295 or 297 valve.

I would also advise to make the pumps aluminum housing look original
and NOT just glass beaded clean. I am a big proponent of having alumnum die castings vibratory tumbled in aluminum media for only a long enough time to look new , NOT polished.

Anybody reading this have pictures showing the pump being taken apart/put together ???
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Old 02-19-2013, 11:14:12 PM   #3
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Mine
120=120th day
0=1970
1=1st shift
S=Saginaw Plant



Rear - 7801149 310 D23

My car build date is 05E
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Old 02-20-2013, 12:13:33 AM   #4
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Old 02-20-2013, 07:44:46 AM   #5
Budz
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Thanks...

Mike, not to bust your chops, but whats with the lower alternator pivot bolt in your pic. I see a nut instead of the bolt head.
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Old 02-20-2013, 12:04:00 PM   #6
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^^ Looks like a BBC cylinder head - AFAIR they used a stud there instead of a bolt like the SBC did.

Gary
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Old 02-20-2013, 01:17:37 PM   #7
DCL70
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Quote:
Originally Posted by Budz
I searched, but want to be sure.

Is this the correct breakdown for this date code: 07501S

075= 75th day (March 16)
0= 1970
1= shift
S= plant

Casting # on back cover: 7801149

The letter "S" is not the plant. It is the broadcast number or pump model.
Examples of other stamped codes on smog pumps:
"11561E"
"0381Y1"
"14711P"

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