1967 Chevelle Engine ID Suffix Codes

The engine identification code consists of the engine assembly plant, the engine assembly date, and 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, alternators, and power steering units were not installed at the engine assembly plant but rather at the final assembly plant.

Engine			Transmission	Notes
Code	Size	HP-RPO
BB	230-1	140	Manual	Heavy Duty Clutch/A.C.
BC	230-1	140	Manual	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	Overdrive/A.I.R.
BO	230-1	140	Manual	A.C./A.I.R.
CA	230-1	140	Manual	Overdrive
CB	230-1	140	Manual	A.C.
CC	230-1	140	Powerglide
CD	230-1	140	Powerglide	A.C.
250 ↓
CM	250-1	155-L22	Manual	Overdrive
CN	250-1	155-L22	Manual	A.C.
CO	250-1	155-L22	Manual	Overdrive/A.I.R.
CP	250-1	155-L22	Manual	A.C./A.I.R.
CQ	250-1	155-L22	Powerglide
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	Overdrive
DB	283-2	195	Manual
DE	283-2	195	Powerglide
DI	283-2	195	Manual	Overdrive/A.I.R.
DJ	283-2	195	Powerglide	A.I.R.
DK	283-2	195	Manual	A.I.R.
DN	283-2	195	Manual	Heavy Duty Clutch
327 ↓
EA	327-4	275-L30	Manual
EB	327-4	275-L30	Manual	A.I.R.
EC	327-4	275-L30	Powerglide	A.I.R.
EE	327-4	275-L30	Powerglide	L30
EO	327-4	275-L30	Manual	Heavy Duty Clutch
327-L79 ↓
EP	327-4	325-L79	Manual
ER	327-4	325-L79	Manual	A.I.R.
ES	327-4	325-L79	Manual	Heavy Duty Clutch
396-L35 ↓
ED	396-4	325-L35	Manual
EH	396-4	325-L35	Manual	A.I.R.
EK	396-4	325-L35	Powerglide
EM	396-4	325-L35	Powerglide	A.I.R.
ET	396-4	325-L35	TH400
EV	396-4	325-L35	TH400	A.I.R.
396-L34 ↓
EF	396-4	350-L34	Manual	Heavy Duty Clutch
EJ	396-4	350-L34	Manual	Heavy Duty Clutch/A.I.R.
EL	396-4	350-L34	Powerglide
EN	396-4	350-L34	Powerglide	A.I.R.
EU	396-4	350-L34	TH400
EW	396-4	350-L34	TH400	A.I.R.
396-L78 ↓
EG*	396-4	375-L78	Manual	A.I.R.
EX	396-4	375-L78	Standard	A.I.R.

* Note EG code not listed in report but EX code is.

According to accepted production numbers, the 396 engine installation breaks down as follows:
2-door sedan pickup L35 as an option - 2,565 ⁽¹⁾
2-door coupe/convertible/sedan pickup L34 350hp high performance engine - 17,176 ⁽²⁾
2-door coupe/convertible/sedan pickup L78 375hp special high performance engine - 612 ⁽³⁾

⁽¹⁾ While the Chevelle El Camino was NOT available in an SS 396 configuration, the L35, L34, and L78 396-cid engines were available in the Chevelle El Camino body style (both 13480 and 13680 series). It is known there were 2,565 L35 396-325hp engine options sold. Since this engine was an option in the Chevelle El Camino and standard equipment on the base SS 396 series, it is apparent that there were 2,565 Chevelle El Caminos ordered with the L35 V8 engine.

⁽²⁾ GM Heritage Center records show 934 L34 El Caminos.

⁽³⁾ Sources indicate there were 630 L78 engines built at the Tonawanda engine plant. Of these, 596 were coded EG for non smog (K19) use, 34 coded EX for California. GM Heritage Center records show 34 L78 El Caminos.

1967 396 V8 Engine Production

The base engine for the SS 396 series for 1967 was the L35 396-cid 325hp engine. This engine (along with the L34 and L78) was also an optional engine in the Chevelle El Camino and 2,565 L35 engines were sold. There were 63,006 SS 396 sport coupes (59,685) and convertibles (3,321) sold. There is no way to know how many of the base L35 engines were sold in SS 396 sport coupes and/or convertibles. One can only take the number of L35 options known to be sold in the Chevelle El Camino body style (2,565) and subtract that from the total number reported by Tonawanda and arrive at a number that would include Total L35 Cars and Service Engines.

This was the first year the TH400 automatic transmission was offered in the Chevelle series and this transmission could only be ordered if a 396 engine was ordered. This is also the first year the air injection reactor (RPO K19) was used on the L78 engine.

All L35 engines were equipped with a Rochester (or Carter equivalent) Quadrajet carburetor; all L34 and L78 engines were equipped with a Holley carburetor.

RPO	hp	Transmission	Suffix	Production	Notes
L35	325	Manual	ED	27,080
L35/K19	325	Manual	EH	4,172	A.I.R.
L35/M35	325	Powerglide	EK	5,666
L35/K19/M35	325	Powerglide	EM	892	A.I.R.
L35/M40	325	TH400	ET	9,166
L35/K19/M40	325	TH400	EV	2,725	A.I.R.
				49,701	Total L35 Engines
				48,748	Total L35 Chevelles *
				953	Service Engines

L34	350	Manual	EF	13,914
L34/K19	350	Manual	EJ	2,176	A.I.R.
L34/M35	350	Powerglide	EL	160
L34/K19/M35	350	Powerglide	EN	18	A.I.R.
L34/M40	350	TH400	EU	1,784
L34/K19/M40	350	TH400	EW	346	A.I.R.
				18,398	Total L34 Engines
				17,176	Total L34 Chevelles
93.4% of total L34 engine production went into Chevelles.				1,222	Service Engines

L78	375	Manual	EG	596
L78/K19	375	Manual	EX	34	A.I.R.
				630	Total L78 Engines
				612	Total L78 Chevelles
97.1% of total L78 engine production went into Chevelles.				18	Service Engines

* 48,748 total L35 Chevelles is computed as follows:					Updated data provided by Jeff Helms
Total SS 396 Chevelles				63,006
Less L34 engine options				-16,245	931 L34s were El Caminos
Less L78 engine options				-0,0578	34 L78s were El Caminos
Total L35 SS 396				46,183
Plus L35 El Camino				02,565
Total L35 engines				48,748

© ChevelleWorld
The 375hp L78 engine was canceled early in the model year and didn't appear as an option until the March/April timeframe. Since it was not promoted only 612 buyers were lucky enough to order one. The L78 was equipped with an aluminum intake manifold and a Holley carburetor #3893229. Also note the deep groove pulley on the alternator.