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Engines - 1966
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Engine |
Transmission |
Notes |
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| 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/EAH* | 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 very little information on the 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 13817/13867 SS 396
and 13480/13680 El Camino.
The L35 396 cid 8-cyl engine was the base, or standard, engine in the
SS 396. 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 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.
All 1966 396 engines came with flash-chromed rocker arm covers, oil caps/breathers, and air cleaner lid whether it was part of an SS 396 or ordered in the El Camino.
Camshaft Specifications
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.
1966 396 V8 Engine Production
The base engine for the SS 396 series for 1966 was the L35 396cid 325hp engine. This engine (along with the L34 and L78) was also an optional engine in the El Camino and 1,865 L35 engines were sold in the El Camino body style. There were 72,272 SS 396 sport coupes (66,380) and convertibles (5,393) 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 El Camino body style (1,865) and subtract that from the total number reported by Tonawanda and arrive at a number that would include Total L35 SS 396 Chevelles and Service Engines.
One cannot take the number of L34 or L78 engines into account for SS 396 sales only since these were also available in the El Camino and only a total number of L34 and L78 options are known; what body style they went into is not known. Since it cannot be determined how many L35 engines were sold in the base SS 396 series (Total L35 Engines) and the number of L35 service engines cannot be determined.
L35 engines could be equipped with either a Rochester (or Carter equivalent) Quadrajet carburetor or Holley carburetor; all L34 and L78 engines were equipped with a Holley carburetor.
| RPO | HP | Transmission | Suffix | Production | Notes |
| L35 | 325 | Manual | ED/EDH | 28,430 | Rochester/Holley |
| L35/K19 | 325 | Manual | EH | 03,775 | Rochester & A.I.R. |
| L35/M35 | 325 | Powerglide | EKR | 00,021 | Rochester |
| L35/M35 | 325 | Powerglide | EK/EKH** | 12,592 | Holley |
| L35/K19/M35 | 325 | Powerglide | EM | 02,963 | A.I.R. |
| 47,781 | Total L35 Engines | ||||
| 46,277 * | Total L35 Chevelles | ||||
| See paragraph above concerning service engines. | 01,554 | Service Engines | |||
| L34 | 360 | Manual | EF | 20,283 | |
| L34/K19 | 360 | Manual | EJ | 04,037 | A.I.R. |
| L34/M35 | 360 | Powerglide | EL | 01,179 | |
| L34/K19/M35 | 360 | Powerglide | EN | 0,0323 | A.I.R. |
| 25,822 | Total L34 Engines | ||||
| 24,811 | Total L34 Chevelles | ||||
| 96.1% of total L34 engine production went into Chevelles in 1966. | 01,011 | Service Engines | |||
| L78 | 375 | Manual | EG | 3,167 | |
| 3,167 | Total L78 Engines | ||||
| 3,099 | Total L78 Chevelles | ||||
| 0,068 | Service Engines | ||||
| 97.9% of total L78 engine production went into
Chevelles in 1966 |
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* It is known that 1,865 of these L35 engines were sold as options in the two El Camino series. ** There seem to be quite a number of L35 Powerglide engines stamped with EKH when equipped with a Holley carburetor. |
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Big-Block Engine Pad Examples
T1111EF ~ Tonawanda Engine Plant, November 11, 1965 ~ EF, 396/360hp
with manual transmission.
T1214EKH ~ Tonawanda Engine Plant, December14, 1965 ~ EKH, 396/325hp
Powerglide transmission & Holley carburetor
T1220EDH ~ Tonawanda Engine Plant, December 20, 1965 - EDH, 396/325hp
with manual transmission, A.I.R., Holley carburetor
T1228EH ~ Tonawanda Engine Plant, December 28, 1965 - EH, 396/325hp
with manual transmission., A.I.R., Rochester carburetor
T0315EKH ~ Tonawanda Engine Plant, March 14, 1966 ~ EKH, 396/325hp Powerglide
transmission & Holley carburetor
T0425EDH ~ Tonawanda Engine Plant, March 25, 1966 ~ EDH, 396/325hp manual
transmission & Holley carburetor
T0426EG ~ Tonawanda Engine Plant, April 26, 1966 ~ EG, 396/375hp manual
transmission
T0607EDH ~ Tonawanda Engine Plant, June 7, 1966 ~ EDH, 396/325hp with
manual transmission & Holley carburetor
T0705EKH ~ Tonawanda Engine Plant, July 5, 1966 ~ EKH, 396/325hp with
Powerglide transmission & Holley carburetor
Small-Block Engine Pad Examples
T1013EAH ~ Tonawanda, NY, October 13, 1965. The suffix code EAH
indicates 327/275hp with manual transmission and Holley carburetor
F1030DH ~ Flint, MI, October 30, 1965. The suffix code DH indicates
283/220hp with Powerglide transmission
F1104DG ~ Flint, MI, November 4, 1965. The suffix code DG indicates
283/220hp with manual transmission
T1228DE ~ This one from Tonawanda Engine Plant and built December 28,
1965. The suffix code DE indicates 283/195hp with Powerglide transmission
F0318EE - Flint, MI, March 18, 1966. The suffix code EE indicates 327/275hp
with Powerglide.
F0701EC - Flint, MI, July 1, 1966. The suffix code EC indicates 327/275hp
with Powerglide and A.I.R.
If you have any photos to share of any stock 1966 engine of any size
or photos of engine pads, please send them along with your name to me
via my contact page.
Want more in-depth information on 1966/1967 Chevelles? Take a test drive of my 1966/1967 Chevelle Reference CD/Factory Assembly Instruction Manuals and check out my Chevelle books.
1966 Chevelle Links
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-
PRODUCTION NUMBERS *
- Vehicle Identification Number
- ENGINES
*
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TIRES & WHEELS *
