Smog pump stamping

[ALLZS]

this is a 68 cast date pump with a very early 68 date is the date stamp in the correct place

[rszmjt]

I have had a few pumps stamped there but most of them are on the small machined area to the right of your stamp.

[firstgenaddict]

Also seen a couple where this one is located... 138th day of 68 Nice pump.

[ALLZS]

this was on a 69 Camaro 1st week of sept of 68 build seem like a early date for that

[60sStuff]

This Smog pump came off an early ‘66 GTO.

Chris.

[MJV1953]

My 1969 Van Nuys Z28 09D 1968 build which still has its original smog pump and is stamped 23481S

[grantprix]

This is my '67 "06D" GTO pump date which is stamped in the machined area.

[60sStuff]

Grant,

Your stamp of 1447 looks to be May 24, 1967 which lines up with your car.

[ALLZS]

way is the last letter differ on these pumps is it a date code or where there where built ?

[rszmjt]

way is the last letter differ on these pumps is it a date code or where there where built ?

Yes the last letter is plant build code, I think S = Saginaw MI, Y = Yipsalanti MI, not sure on the Z and U, Maybe someone will add to the post.