ENGINE IDENTIFICATION

The engine identification code consists of the engine assembly plant, the engine assembly date, and a 2 or 3 letter suffix indicating the cubic inch displacement, the horsepower rating, and generally, what type of transmission was to be installed with the engine. Manual transmissions required a bushing in the rear of the bellhousing where an automatic transmission did not. Many engine "accessories" such as the carburetor, distributor, and exhaust manifolds were not installed at the engine assembly plant but rather at the final assembly plant.

T = Tonawanda Engine Plant
0501 = May 1
EF = 396/350 L34 Manual 3-/4-speed w/HD Clutch

Engine Assembly Plant - 1st letter

Code Assembly Plant
 V Flint, Michigan
*T Tonawanda Engine Plant
   
Assembly Month - 1st and 2nd numbers
Number Month Number Month
01 January 02 February
03 March 04 April
*05 May 06 June
07 July 08 August
09 September 15 October
11 November 12 December
       

Assembly Day - 3rd and 4th numbers
01...31
 

Engine

Transmission

Notes

Code Size HP  
BB 230-1 140 Manual-3 Heavy Duty Clutch/A.C.
BC 230-1 140 Manual-3 Heavy Duty Clutch
BL 230-1 140 Powerglide A.I.R.
BM 230-1 140 Powerglide A.C./A.I.R.
BN 230-1 140 Manual-3 Overdrive/A.I.R.
BO 230-1 140 Manual-3 A.C./A.I.R.
CA 230-1 140 Manual-3 Overdrive
CB 230-1 140 Manual-3 A.C.
CC 230-1 140 Powerglide  
CD 230-1 140 Powerglide A.C.
250 ↓        
CM 250-1 155-L22 Manual-3 Overdrive
CN 250-1 155-L22 Manual-3 A.C.
CO 250-1 155-L22 Manual-3 Overdrive/A.I.R.
CP 250-1 155-L22 Manual-3 A.C./A.I.R.
CR 250-1 155-L22 Powerglide A.C.
CS 250-1 155-L22 Powerglide A.I.R.
CT 250-1 155-L22 Powerglide A.C./A.I.R
283 ↓        
DA 283-2 195 Manual-3 Overdrive
DB 283-2 195 Manual-4  
DE 283-2 195 Powerglide  
DI 283-2 195 Manual-3 Overdrive/A.I.R.
DJ 283-2 195 Powerglide A.I.R.
DK 283-2 195 Manual-4 A.I.R.
DN 283-2 195 Manual-3 Heavy Duty Clutch
327 ↓        
EA 327-4 275-L30 Manual-3/4  
EB 327-4 275-L30 Manual-3/4 A.I.R.
EC 327-4 275-L30 Powerglide A.I.R.
ED 396-4 325 Manual-3/4  
EE 327-4 275-L30 Powerglide L30
EP 327-4 325-L79 Manual-3/4  
EQ 327-4 275-L30 Manual-3 Heavy Duty Clutch
ER 327-4 325-L79 Manual-3/4 A.I.R.
ES 327-4 325-L79 Manual-3 Heavy Duty Clutch
396 ↓        
*EF 396-4 350-L34 Manual-3/4 Heavy Duty Clutch
EG 396-4 375-L78 Manual-3/4  
EH 396-4 325-L35 Manual-3/4 A.I.R.
EJ 396-4 350-L34 Manual-3/4 Heavy Duty Clutch/A.I.R.
EK 396-4 325-L35 Powerglide  
EL 396-4 350-L34 Powerglide  
EM 396-4 325-L35 Powerglide A.I.R.
EN 396-4 350-L34 Powerglide A.I.R.
ET 396-4 325-L35 TH-400  
EU 396-4 350-L34 TH-400  
EV 396-4 325-L35 TH-400 A.I.R.
EW 396-4 350-L34 TH-400 A.I.R.
EX 396-4 375-L78 Standard A.I.R.