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1970 El Camino Engine ID 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, distributor, and exhaust manifolds were not installed at the engine assembly plant but rather at the final assembly plant.

Engine

Transmission

Notes

Code

Size-Carb

HP-RPO

   
CCK 250-1 155 TH-350 Taxi, Police
CCL 250-1 155 Manual-3 Taxi, Police
CCM 250-1 155 Powerglide Taxi, Police
CNC 307-2 200 Manual-3/4  
CND 307-2 200 Manual-4  
CNE 307-2 200 Powerglide  
CNF 307-2 200 TH-350  
CNG 307-2   Manual-3 Low Compression Engine
CNH 307-2   Powerglide Low Compression Engine
CNI * 350-2 250-L65 Manual-3/4  
CNJ * 350-4 300-L48 Manual-3/4  
CNK * 350-4 300-L48 Powerglide  
CNM * 350-2 250-L65 Powerglide  
CNN * 350-2 250-L65 TH-350  
CRE * 350-4 300-L48 TH-350  
CRH ** 400-2 265-LF6 TH-350 (Monte Carlo)
CKN * 402-4 330-LS3 TH-400  
CKO 402-4 375-L78 Manual-4  
CKP 402-4 375-L78 (w/L89) TH-400 Aluminum Heads
CKQ 402-4 375-L78 Manual-3/4 Heavy Duty Clutch
CKR * 402-4 330-LS3 Manual-3/4  
CKS 402-4 330-LS3 Manual-3/4 Heavy Duty Clutch/LS3
CKT 402-4 375-L78 (w/L89) Manual-3/4 Aluminum Heads
CKU 402-4 375-L78 (w/L89) Manual-3/4 Heavy Duty Clutch/Aluminum Heads
CTW 402-4 350-L34 TH-400  
CTX 402-4 350-L34 Manual-3/4  
CTY 402-4 375-L78 TH-400  
CTZ 402-4 350-L34 Manual-3/4 Heavy Duty Clutch
CRH 400-2 265-LF6 TH-350 (small block)
CZX 400-2 265-LF6 Manual-3/4 (small block)
CRN * 454-4 360-LS5 TH-400 Monte Carlo
CRQ 454-4 360-LS5 TH-400  
CRR 454-4 450-LS6 TH-400  
CRS (1) 454-4 450-LS6(w/L89) TH-400 Aluminum Heads
CRT 454-4 360-LS5 Manual 4-speed  
CRU 454-4 360-LS5 Manual 4-speed Heavy Duty Clutch
CRV 454-4 450-LS6 Manual M22  
CRX 454-4 450-LS6 Manual M22 Heavy Duty Clutch
CRY (1) 454-4 450-LS6(w/L89) Manual M22 Aluminum Heads/Heavy Duty Clutch
CZX * 400-2 265-LF6 Manual 4-speed Monte Carlo

Notes:

(1) There is some discussion about the 454 being sold with 454 engines and aluminum heads. One very respected source says that according to records at Tonawanda no 454 with aluminum heads. Their records indicate the L89 option was cancelled (not replaced) with the demise of the L78/L89 combination. On the other hand, some have reported seeing the CRS code on engine blocks and one registrant here has a dealer bill-of-sale plus the warranty protect-o-plate card both showing the CRY code.

These figures are for the U.S. production of Chevelles only (unless otherwise indicated) and does not include the Monte Carlo.
A total of 39,207 6-cyl engines were installed; 29,791 in U.S. built Chevelles and 10,416 imported from Canada.
A total of 413,255 8-cyl engines were installed; 198,285 307cid, 150,745 350cid, and 64,225 402/454cid engines.

* Monte Carlo exclusive

CGR engine suffix has been noted on a Canadian-built LS3 Chevelle with manual transmission.

How this 64,225 figure of combined 402/454 engines was arrived at is not known. Given the number of Z25 and Z15 options (including optional L78 and LS6 engines), the total arrived at is 63,372 for SS optioned Chevelles but this total includes the two SS options both exported to and imported from Canada so the exact U.S. figures are difficult to ascertain.

GM of Canada documents indicate that 3,306 Z25 optioned Chevelle Sport Coupes along with 299 Z15 (LS5 only) optioned Chevelle Sport Coupes were exported for sale to the U.S.

In addition to these imports and exports, a total of 9,338 LS3 engines must be accounted for somewhere in this 64,225 402/454 engine figure.
 
53,599 - Z25 SS396 options ordered (51,455 base L34 plus 2,144 optional RPO L78)
  8,773 - Z15 SS454 options ordered (4,298 base LS5 plus 4,475 optional RPO LS6)

Chevrolet only reports 442,046 engines and transmissions on the Accumulative Production Report of August 31, 1970. This number is only for U.S. built Chevelles. There is no breakdown of engines or transmissions imported from Canada.

09/22/2009

09/21/2009

09/21/2009