General InformationYear: 1957Make: ChevroletSeries: E Model: CorvetteEngine: 283ciorsepower: 270Transmission: Four-speed Borg-Warner T10Engine-code suffix: EG
BlockCasting No.: 3731548Main: Two-bolt
Cylinder HeadCasting No.: 3740997Intake/Exhaust Valve Size: 1.72/1.50Combustion Chamber: 55.6685
Intake Manifold (Aluminum)Casting No.: 3739653Carb Type: 2x4bbl Carter WCFB
CarburetorCarter List No.: 2613 S front/2614 S rearGM Part No.: 3741089Air Horn Casting No.: 6-1299 (both carbs)Main Body Casting No.: 0-049, 0-1049
Exhaust ManifoldsCasting (Lefthand) No.: 3733985 Casting (Righthand) No.: 3733976
DistributorStamping No.: 1110891Engine/HP/: 283/270hpHousing: Cast-iron bowlPoint: DualNotes: No vacuum advance, standpipe oiler
Alternator1102043, 30-amp, std., tach drive
TransmissionFour-Speed Close-Ratio Borg-WarnerMaincase: Cast-ironTailhousing: AluminumType: SynchromeshGear RatiosFirst: 2.21:1Second: 1.66:1Third: 1.31:1Fourth: DirectReverse: 2.25:1Maincase No.: T10-1Tailhousing No.: T10-7Side Cover No.: T10-148Special Information: Became available in May 1957
'57 Rear AxlesThe numbers following the letter prefix designate the calendar month and day that axle was produced. From the '55 through '62 model years the calendar month was designated by a one-number code from January (1) through September (9). The October through December codes were designated as 10 to 12 respectively. Beginning with the '63 model year, all month designations begin with a zero, so the January date code would show "01" instead of "1" as in previous years.
| Month Code Designations |
| 1 = January | 7 = July |
| 2 = February | 8 = August |
| 3 = March | 9 = September |
| 4 = April | 10 = October |
| 5 = May | 11 = November |
| 6 = June | 12 = December |
Plant CodesG = Detroit Gear & AxleExample: AE-409AE = 3.36:1 axle assembly for Powerglide Corvette built at Detroit Gear & Axle4 = Month: April09 = Day: 9th day
’57 Corvette
Rear-Axle Codes | | Series | Ratio | Description | Code | Source |
| 2934 | 3.36:1 | Powerglide | AE | G |
| | 3.70:1 | Manual | AH | G |
| 3.70:1Posi | Manual | AN | G |
| 4.11:1Posi | Manual | AP | G |
| 4.56:1Posi | Manual | AQ | G |
| 3.70:1Posi | Manual | AS* | G |
| 4.11:1 Posi | Manual | AT* | G |
| 4.56:1 Posi | Manual | AU* | G |
*These rear axles were part of number 684 option code released approximately 3/1/57 that included heavy-duty brakes and suspensions.
From Corvette By The Numbers by Alan Colvin, published in 2002, used with permission of Robert Bentley Publishers.