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1975 Emissions System – AIR Pump, brackets, hoses, check valves-Smog System
This is a partial emissions system from a 1975 Corvette that I purchased with a bulk lot of parts back in 1983. It has been on my basement shelf ever since.
Pump turns freely and pumps air. You can feel the air when you put your thumb over the diverter valve outlet
A.I.R. Pump date code of 03851S (38th day of 1975, first shift, Model S pump), Date is hard to read. You need a magnifying glass.
A.I.R. back plate casting number 7817872. A.I.R. pump pulley is stamped 3927116, which is correct for A/C equipped cars. Pulley has correct offset groove
Diverter Valve stamps are unreadable. One check valve is stamped 4974265 with a date stamp of 1074. Engine mounting bracket is stamped 3923214
Includes hoses, 2 check valves, engine mounting bracket and adjusting arm
All parts came from a 1975 Corvette and are correct for a 1975 Corvette
$250 PayPal F&F plus shipping from 60527. Please PM me with any questions or if additional pictures are needed.
A.I.R. back plate casting number 7817872
Pully Stamping 3927116
Pump Stamping 03851S
Engine mounting bracket
Hoses and check valves
Engine mounting bracket stamping 3923214
Last edited by '73and'75; May 13, 2026 at 05:21 PM.
1975 Emissions System – AIR Pump, brackets, hoses, check valves-Smog System
