1967 Chevelle Protect-O-Plate Decoding Engine

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.