ENGINE IDENTIFICATION

The engine identification code consists of the engine assembly plant, the engine assembly date, and a 2 or 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.

T = Tonawanda, NY assembly plant
0121 = January 21
CCC = 307/200 Powerglide or TH350

Engine Assembly Plant - 1st letter
Code Assembly Plant
F or V Flint, MI
*T Tonawanda, NY
   
Assembly Month - 1st and 2nd numbers
Number Month Number Month
*01 *January 02 February
03 March 04 April
05 May 06 June
07 July 08 August
09 September 10 October
11 November 12 December
       

Assembly Day - 3rd and 4th numbers
01...31
 

Engine

Transmission

Notes
Code Size HP  
CAA 250-1 145 Manual-3/4  
CAB 250-1 145 Powerglide/TH350  
CCA 307-2 200 Manual-3/4  
*CCC 307-2 200 Powerglide/TH350  
CGA 350-2 245-L65    
CGB 350-2 245-L65 Powerglide  
CGC 350-2 245-L65 TH-350  
CGK 350-4 270-L48 Standard  
CGL 350-4 270-L48 TH-350  
CJD 350-4 270-L48 TH-350  
CJJ 350-4 270-L48 Standard  
CLA 402-4 300-LS3 Standard  
CLB 402-4 300-LS3 TH-400  
CLL 402-4 300-LS3 Manual-4  
CLP 402-4 300-LS3 Manual-3/4  
CLR 402-4 300-LS3 Standard Police
CLS 402-4 300-LS3 HD 3-speed (MC1)  
CAJ 400-2 255 Standard  
CLK 400-2 255 TH-350  
CPA 454-4 365-LS5 Manual-3/4  
CPD 454-4 365-LS5 TH-400  
CPP 454-4 365-LS6 Manual-3/4 There is no proof the LS6 was ever offered to the public in a Chevelle
CPY 454-4 425-LS6 TH-400 There is no proof the LS6 was ever offered to the public in a Chevelle
CPZ 454-4 425-LS6 Manual-3/4 There is no proof the LS6 was ever offered to the public in a Chevelle