Complete Identification of each body is stamped on a plate on the upper left cowl under the hood.
THE BUILD DATE: The first 2 digits identify the month and the letter identifies the week.
CODE MONTH CODE WEEK
01.................. January A...................... 1st
02.................. February B....................... 2nd
03.................. March C...................... 3rd
04.................. April D....................... 4th
05.................. May E....................... 5th
06.................. June
07.................. July
08.................. August
09.................. September
10.................. October
11.................. November
12.................. December
THE STYLE NUMBER is a combination of the series and body style.
F85 STANDARDCODE
Standard Club Coupe V6 ................................... 3327
Standard Club Coupe V8 ................................... 3427
( Very limited or no chrome, short hood spear, no tail panel, just chrome bars and emblem and usually rubber floor.) This model made a lean drag car with the 442 option.
DELUXE
Sports Coupe V6 ................................................ 3527
CUTLASS
Sports Coupe ( post ) .......................................... 3827
Holiday Coupe ................................................... 3837
The engine identification / unit number is stamped on a machined pad located at the front of the right cylinder head. (may be at the rear of the left head, if they were swapped) It contains a prefix code, an engine unit number and sometimes a suffix code.
EXAMPLE: V056530L
Prefix V Suffix L No. Cyl 8 HP 345 Comp 10.25:1 Carb 4 GC 7025150
THE 2 SPEED AUTOMATIC TRANSMISSION
The Jet-A-Way was the Oldsmobile name for the GM Super Turbine 300. They are completely different from the Powerglide. The Jet-A-Way was the only automatic available for the 65 & 66 4-4-2's. A "Special Duty" Jet-A-Way was used in the 4-4-2. It featured additional forward and reverse clutches, a recalibrated valve body for a more positive (harder) shift and other performance improvements. NOTE: Some very early 65,s use a TH400 style metal tag with Jet-A-Way codes
The code is either stamped on a metal tag or on the lower servo cover. It identifies the year, model, date built and plant shift.
Transmission code is stamped on the right side of the case ahead of the extention. The code indicates the transmission type, the month and day produced and on which shift it was produced. (Not found on all transmissions)