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

CodeAssembly Plant
 VFlint, Michigan
*TTonawanda Engine Plant
  
Assembly Month - 1st and 2nd numbers
NumberMonthNumberMonth
01January02February
03March04April
*05May06June
07July08August
09September15October
11November12December
    

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

Engine

Transmission

Notes

CodeSizeHP 
BB230-1140Manual-3Heavy Duty Clutch/A.C.
BC230-1140Manual-3Heavy Duty Clutch
BL230-1140PowerglideA.I.R.
BM230-1140PowerglideA.C./A.I.R.
BN230-1140Manual-3Overdrive/A.I.R.
BO230-1140Manual-3A.C./A.I.R.
CA230-1140Manual-3Overdrive
CB230-1140Manual-3A.C.
CC230-1140Powerglide 
CD230-1140PowerglideA.C.
250 ↓    
CM250-1155-L22Manual-3Overdrive
CN250-1155-L22Manual-3A.C.
CO250-1155-L22Manual-3Overdrive/A.I.R.
CP250-1155-L22Manual-3A.C./A.I.R.
CR250-1155-L22PowerglideA.C.
CS250-1155-L22PowerglideA.I.R.
CT250-1155-L22PowerglideA.C./A.I.R
283 ↓    
DA283-2195Manual-3Overdrive
DB283-2195Manual-4 
DE283-2195Powerglide 
DI283-2195Manual-3Overdrive/A.I.R.
DJ283-2195PowerglideA.I.R.
DK283-2195Manual-4A.I.R.
DN283-2195Manual-3Heavy Duty Clutch
327 ↓    
EA327-4275-L30Manual-3/4 
EB327-4275-L30Manual-3/4A.I.R.
EC327-4275-L30PowerglideA.I.R.
ED396-4325Manual-3/4 
EE327-4275-L30PowerglideL30
EP327-4325-L79Manual-3/4 
EQ327-4275-L30Manual-3Heavy Duty Clutch
ER327-4325-L79Manual-3/4A.I.R.
ES327-4325-L79Manual-3Heavy Duty Clutch
396 ↓    
*EF396-4350-L34Manual-3/4Heavy Duty Clutch
EG396-4375-L78Manual-3/4 
EH396-4325-L35Manual-3/4A.I.R.
EJ396-4350-L34Manual-3/4Heavy Duty Clutch/A.I.R.
EK396-4325-L35Powerglide 
EL396-4350-L34Powerglide 
EM396-4325-L35PowerglideA.I.R.
EN396-4350-L34PowerglideA.I.R.
ET396-4325-L35TH-400 
EU396-4350-L34TH-400 
EV396-4325-L35TH-400A.I.R.
EW396-4350-L34TH-400A.I.R.
EX396-4375-L78StandardA.I.R.