1966 Chevelle Engine ID Codes - Engine Pad

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

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.
230 ↓    
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.
283 ↓    
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.
327 ↓    
EA/EAH*327-4275-L30Manual-3/4 
EB327-4275-L30Manual-3/4A.I.R.
EC327-4275-L30PowerglideA.I.R.
EE327-4275-L30Powerglide
396 ↓    
EDH*396-4325-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
EKR396-4325-L35PowerglideRochester Carb
EL396-4360-L34Powerglide 
EM396-4325-L35PowerglideA.I.R./Rochester Carb
EN396-4360-L34PowerglideA.I.R.
327 n/a ↓    
EP**327-4350-L79H.D. 3-speed or 4-speed 
ER**327-4350-L79H.D. 3-speed or 4-speedA.I.R.
ES**327-4350-L79H.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. The L78 engine option was canceled early in 1965 and reinstated October 7, 1965. Many early Chevrolet publication materials, such as this page from an early training program booklet also listed this engine at 425hp and, oddly, the L34 (360hp) engine does not show a horsepower rating at all.

* Engine blocks may be stamped with "EK" or may be stamped with "EKH" suffix noting Holley (H) 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.


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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