1966 Chevelle Engine ID Codes - Engine Pad

[ 1964 ] | [ 1965 ] | [ 1966 ] | [ 1967 ] | [ 1968 ] | [ 1969 ] | [ 1970 ] | [ 1971 ] | [ 1972 ]

Engine

Transmission

Notes

Code Size-Carb HP-RPO    
AA 194-1 120 Manual-3 Overdrive
AC 194-1 120 Manual-3 Heavy Duty Clutch
AG 194-1 120 Manual-3 A.C.
AH 194-1 120 Manual-3 Heavy Duty Clutch/A.C.
AL 194-1 120 Powerglide  
AS 194-1 120 Manual-3 Overdrive/A.I.R.
AT 194-1 120 Manual-3 A.C./A.I.R.
230 ↓        
BL 230-1 140-L26 Powerglide A.I.R.
BM 230-1 140-L26 Powerglide A.C./A.I.R.
BN 230-1 140-L26 Manual-3 Overdrive/A.I.R.
BO 230-1 140-L26 Manual-3 A.C./A.I.R.
CA 230-1 140-L26 Manual-3 Overdrive
CB 230-1 140-L26 Manual-3 A.C.
CC 230-1 140-L26 Powerglide  
CD 230-1 140-L26 Powerglide A.C.
283 ↓        
DA 283-2 195 Manual-3  
DB 283-2 195 Manual-4  
DE 283-2 195 Powerglide  
DG 283-4 220-L77 Manual-3/4  
DH 283-4 220-L77 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.
DL 283-4 220-L77 Manual-3/4 A.I.R.
DM 283-4 220-L77 Powerglide A.I.R.
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.
EE 327-4 275-L30 Powerglide
396 ↓        
EDH* 396-4 325-L35 Manual-3/4  
EF 396-4 360-L34 Manual-3/4  
EG 396-4 375-L78 Manual-3/4 Holley Carb/Solid Cam
EH 396-4 325-L35 Manual-3/4 A.I.R./Rochester Carb
EJ 396-4 360-L34 Manual-3/4 A.I.R.
EKH* 396-4 325-L35 Powerglide Holley Carb
EKR* 396-4 325-L35 Powerglide Rochester Carb
EL 396-4 360-L34 Powerglide  
EM 396-4 325-L35 Powerglide A.I.R./Rochester Carb
EN 396-4 360-L34 Powerglide A.I.R.
327 n/a ↓        
EP** 327-4 350-L79 H.D. 3-speed or 4-speed  
ER** 327-4 350-L79 H.D. 3-speed or 4-speed A.I.R.
ES** 327-4 350-L79 H.D. 3-speed or 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 396 cid 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 (H) or Rochester (R) 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.

Camshaft Specifications

12/03/2010

1967 saw the first year the 396 V8 camshaft abandoned the grooved rear journal and matching bearing in the engine block in favor of a smooth journal like the 283/327 V8. Any camshaft from a 1965 or 1966 396 engine can be used in a 1967 or later block but not the other way around. This groove is clearly visible in this photo on the camshaft on the left.

CHEVELLESTUFF  All Rights Reserved
Photo courtesy Bruce Testor

Note the oil groove in rear cam journal of this 396 V8 camshaft on the left. Both 1965 and 1966 396 V8 engines require this groove along with corresponding rear cam bearing. Most aftermarket camshaft manufacturers DO NOT list the 65/66 396 V8 in their catalogs due to this groove. However, any later camshaft will work if grooved and most aftermarket cam suppliers will either groove the cam for a nominal fee or send you the specifications so you can have your local machine shop perform the operation.


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