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 Engine Plant
0918 = September 18
PD = 396/350 L34 Manual 3/4-speed w/HD Clutch

Engine Assembly Plant - 1st letter

CodeAssembly Plant
VFlint, Michigan
KMcKinnon Industries
*TTonawanda Engine Plant
  
Assembly Month - 1st and 2nd numbers
NumberMonthNumberMonth
01January02February
03March04April
05May06June
07July08August
*09*September10October
11November12December
    

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

Engine

Transmission

Notes

CodeSizeHP 
CAA250-1145Manual-3/4 
CAB250-1145Powerglide/TH350 
307 ↓    
CCA307-2200Manual-3/4 
CCC307-2200Powerglide/TH350 
350 ↓    
CGA350-2245-L65  
CGB350-2245-L65Powerglide 
CGC350-2245-L65TH-350 
CGK350-4270-L48Standard 
CGL350-4270-L48TH-350 
CJD350-4270-L48TH-350 
CJJ350-4270-L48Standard 
402 ↓    
CLA402-4300-LS3Standard 
CLB402-4300-LS3TH-400 
CLL402-4300-LS3Manual-4 
CLP402-4300-LS3Manual-3/4 
CLR402-4300-LS3StandardPolice
CLS402-4300-LS3HD 3-speed (MC1) 
454 ↓    
CPA454-4365-LS5Manual-3/4 
*CPD454-4365-LS5TH-400 
CPP454-4365-LS6Manual-3/4There is no proof the LS6 was ever offered to the public in a Chevelle
CPY454-4425-LS6TH-400There is no proof the LS6 was ever offered to the public in a Chevelle
CPZ454-4425-LS6Manual-3/4There is no proof the LS6 was ever offered to the public in a Chevelle