1966 Chevelle Engine ID Codes

Engine

Transmission

Notes

CodeSize-CarbHP-RPO  
AA194-1120Manual-3Overdrive
AC194-1120Manual-3Heavy Duty Clutch
AG194-1120Manual-3A.C.
AH194-1120Manual-3Heavy Duty Clutch/A.C.
AL194-1120Powerglide 
AS194-1120Manual-3Overdrive/A.I.R.
AT194-1120Manual-3A.C./A.I.R.
BL230-1140-L26PowerglideA.I.R.
BM230-1140-L26PowerglideA.C./A.I.R.
BN230-1140-L26Manual-3Overdrive/A.I.R.
BO230-1140-L26Manual-3A.C./A.I.R.
CA230-1140-L26Manual-3Overdrive
CB230-1140-L26Manual-3A.C.
CC230-1140-L26Powerglide 
CD230-1140-L26PowerglideA.C.
DA283-2195Manual-3 
DB283-2195Manual-4 
DE283-2195Powerglide 
DG283-4220-L77Manual-3/4 
DH283-4220-L77Powerglide 
DI283-2195Manual-3Overdrive/A.I.R.
DJ283-2195PowerglideA.I.R.
DK283-2195Manual-4A.I.R.
DL283-4220-L77Manual-3/4A.I.R.
DM283-4220-L77PowerglideA.I.R.
EA327-4275-L30Manual-3/4 
EB327-4275-L30Manual-3/4A.I.R.
EC327-4275-L30PowerglideA.I.R.
EE327-4275-L30Powerglide 
ED396-4325-L35Manual-3/4 
EF396-4360-L34Manual-3/4 
EG396-4375-L78Manual-3/4Holley Carb/Solid Cam
EH396-4325-L35Manual-3/4A.I.R./Rochester Carb
EJ396-4360-L34Manual-3/4A.I.R.
EKH*396-4325-L35PowerglideHolley Carb
EKR*396-4325-L35PowerglideRochester Carb
EL396-4360-L34Powerglide 
EM396-4325-L35PowerglideA.I.R./Rochester Carb
EN396-4360-L34PowerglideA.I.R.
EP**327-4350-L79H.D. 3-speed of 4-speed 
ER**327-4350-L79H.D. 3-speed of 4-speedA.I.R.
ES**327-4350-L79H.D. 3-speed of 4-speed 

A total of 116,551 6-cyl engines were installed; 49,608 194cid and 66,943 230cid engines.
A total of 330,813 8-cyl engines were installed; 209,338 283cid, 46,230 327cid, and 75,245 396cid engines.

There is no breakdown of engine type or size by specific series/model other than 6-cyl. vs. 8-cyl.
The 396 8-cyl engine was only available in the 13817/67 SS396 and 134/13680 El Camino.
The L35 396cid 8-cyl engine was the base, or standard, engine in the SS396. GM reports 1,865 L35 engines ordered as options and these would have been installed in the El Camino series.

There were 3,099 375hp L78 engines installed in 1966 Super Sports and El Caminos.

*Engine blocks may or may not be stamped with "H" or "R" suffix noting Holley or Rochester carburetor.

** Chevrolet production records show this engine in production as early as February 7, 1966 and release date in late February or early March. However, 1966 Chevrolet RPO Production Numbers show no indication of this engine being sold.

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