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Big  Block Chevy Suffix Codes: CTH - IJ
GM body designation. All these are identified here. Quickly, A = Chevelle, F = Camaro, X = Nova. If you're looking at the engine code - this is already known. If you're looking at the casting # information and it mentions 3970010 "A/F/X/Y/B".... basically this means "it's used in everything", whereas if it simply states "Y"... this means Corvette. 
  Abbreviations:  AB = Air Brakes, AR = Air Injector Reactor, CA = California, 
  HD = Heavy Duty, hdc = heavy duty clutch, HP = High Performance, LP = Liquid Propane Gas,  
  PG =  Powerglide, mt = manual trans, mt-3, 3 speed manual, SHP = Special High Performance, 
  TH = Turbo Hydramatic, ti = transistor ignition. 
Induction is one (1) 4 barrel carburetor unless specified. 
| Code | 
Year | 
Model | 
CID | 
HP | 
Trans | 
Application | 
 
  | CTH | 
  1972 | Chevelle | 402  | 240  | Mt | AR |  
  | CTH | 
  1972 | Chevelle | 396  | 240  | Mt | AR |  
  | CTJ | 
  1972 | Monte Carlo | 402  | 210  | TH |   |  
  | CTJ | 
  1972 | Chevelle | 396  | 240  | TH | AR |  
  | CTJ | 
  1972 | Chevrolet | 402  | 210  | Mt | AR |  
  | CTJ | 
  1972 | Chevrolet | 396  | 210  | Mt | AR |  
  | CTJ | 
  1972 | Chevelle | 402  | 240  | TH | AR |  
  | CTJ | 
  1972 | Monte Carlo | 396  | 210  | TH |   |  
  | CTW | 
  1970 | Chevy II | 396  | 350 | TH | HP |  
  | CTW | 
  1970 | Chevy II | 396  | 375  | TH | SHP |  
  | CTW | 
  1970 | Camaro | 396	  | 350 | TH | HP |  
  | CTW | 
  1970 | Chevelle | 396  | 350 | TH | HP |  
  | CTX | 
  1970 | Chevy II | 396  | 350 | Mt | HP |  
  | CTX | 
  1970 | Chevelle | 396  | 350 | Mt | HP |  
  | CTX | 
  1970 | Camaro | 396	  | 350 | Mt | HP |  
  | CTY | 
  1970 | Camaro | 396	  | 375  | TH | SHP |  
  | CTY | 
  1970 | Chevelle | 396  | 375  | TH | SHP |  
  | CTZ | 
  1970 | Chevelle | 396  | 350 | Mt | HP |  
  | CTZ | 
  1970 | Chevy II | 396  | 350 | Mt | HP |  
  | CWA | 
  1974 | Chevelle | 454  | 235  | Mt |   |  
  | CWA | 
  1973 | Chevelle | 454  | 250  | Mt |   |  
  | CWB | 
  1973 | Chevelle | 454  | 250  | TH |   |  
  | CWB | 
  1973 | Monte Carlo | 454  | 245  | TH |   |  
  | CWC | 
  1973 | Chevelle | 454  | 250  | Mt | CA |  
  | CWD | 
  1974 | Monte Carlo | 454  | 235  | TH |   |  
  | CWD | 
  1973 | Chevrolet | 454  | 250  | TH | CA |  
  | CWD | 
  1973 | Chevelle | 454  | 250  | TH | CA |  
  | CWD | 
  1974 | Chevelle | 454  | 235  | TH | CA |  
  | CWD | 
  1973 | Monte Carlo | 454  | 245  | TH | CA |  
  | CWI | 
  1973 | Chevrolet | 454  | 250  | TH | CA |  
  | CWK | 
  1973 | Chevrolet | 454  | 250  | TH |   |  
  | CWL | 
  1973 | Chevrolet | 454  | 250  | TH |   |  
  | CWM | 
  1973 | Corvette | 454  | 275  | Mt |   |  
  | CWM | 
  1974 | Corvette | 454  | 270  | Mt |   |  
  | CWR | 
  1974 | Corvette | 454  | 270  | TH |   |  
  | CWR | 
  1973 | Corvette | 454  | 275  | at |   |  
  | CWS | 
  1973 | Corvette | 454  | 275  | at | CA |  
  | CWS | 
  1974 | Corvette | 454  | 270  | TH | CA |  
  | CWT | 
  1973 | Corvette | 454  | 275  | Mt | CA |  
  | CWT | 
  1974 | Corvette | 454  | 270  | Mt |   |  
  | CWU | 
  1974 | Chevrolet | 454  | 235  | TH | Police |  
  | CWW | 
  1974 | Chevrolet | 454  | 235  | TH | CA Police |  
  | CWX | 
  1974 | Monte Carlo | 454  | 235  | TH |   |  
  | CWX | 
  1974 | Chevelle | 454  | 235  | TH |   |  
  | CWY | 
  1974 | Chevrolet | 454  | 235  | TH | CA |  
  | CXA | 
  1974 | Chevrolet | 454  | 235  | TH | CA |  
  | CXB | 
  1974 | Chevrolet | 454  | 235  | TH | CA |  
  | CXC | 
  1974 | Chevrolet | 454  | 235  | TH | CA |  
  | CXK | 
  1975 | Chevrolet | 454  | 215  | TH |   |  
  | CXL | 
  1975 | Chevrolet | 454  | 215  | TH |   |  
  | CXM | 
  1974 | Chevelle | 454  | 235  | Mt |   |  
  | CXR | 
  1974 | Monte Carlo | 454  | 235  | TH |   |  
  | CXR | 
  1974 | Chevelle | 454  | 235  | TH |   |  
  | CXS | 
  1974 | Chevelle | 454  | 235  | TH |   |  
  | CXS | 
  1974 | Monte Carlo | 454  | 235  | TH |   |  
  | CXT | 
  1974 | Chevrolet | 454  | 235  | TH |   |  
  | CXU | 
  1974 | Chevrolet | 454  | 235  | TH |   |  
  | CXW | 
  1975 | Chevelle | 454  | 215  | TH |   |  
  | CXX | 
  1976 | Chevrolet | 454  | 225  | TH | LS4 |  
  | CXX | 
  1975 | Chevrolet | 454  | 215  | TH |   |  
  | CXY | 
  1975 | Chevrolet | 454  | 215  | TH |   |  
  | CZL | 
  1970 | Corvette | 454  | 465  | Mt | HD |  
  | CZN | 
  1970 | Corvette | 454  | 465  | TH | HD |  
  | CZU | 
  1970 | Corvette | 454  | 390  | Mt | HP |  
  | ED | 
  1968 | Chevelle | 396  | 325  | Mt |   |  
  | ED | 
  1966 | Chevelle | 396  | 325  | Mt |   |  
  | ED | 
  1967 | Chevelle | 396  | 325  | Mt |   |  
  | EF | 
  1967 | Chevelle | 396  | 350 | Mt | HP |  
  | EF | 
  1966 | Chevelle | 396  | 360  | Mt | HP |  
  | EF | 
  1968 | Chevelle | 396  | 350 | Mt | HP |  
  | EG | 
  1967 | Chevelle | 396  | 375  | Mt | SHP |  
  | EG | 
  1966 | Chevelle | 396  | 375  | Mt | SHP |  
  | EG | 
  1968 | Chevelle | 396  | 375  | Mt | SHP |  
  | EH | 
  1966 | Chevelle | 396  | 325  | Mt |   |  
  | EH | 
  1967 | Chevelle | 396  | 325  | Mt |   |  
  | EI | 
  1967 | Camaro | 396  | 350 |   | HP |  
  | EJ | 
  1967 | Chevelle | 396  | 350 | Mt | HP |  
  | EJ | 
  1966 | Chevelle | 396  | 360  | Mt | HP |  
  | EK | 
  1967 | Chevelle | 396  | 325  | PG |   |  
  | EK | 
  1966 | Chevelle | 396  | 325  | PG |   |  
  | EK | 
  1968 | Chevelle | 396  | 325  | PG |   |  
  | EL | 
  1967 | Chevelle | 396  | 350 | PG | HP |  
  | EL | 
  1968 | Chevelle | 396  | 350 | PG | HP |  
  | EL | 
  1966 | Chevelle | 396  | 360  | PG | HP |  
  | EM | 
  1966 | Chevelle | 396  | 325  | PG |   |  
  | EM | 
  1967 | Chevelle | 396  | 325  | PG |   |  
  | EN | 
  1967 | Chevelle | 396  | 350 | PG | HP |  
  | EN | 
  1966 | Chevelle | 396  | 360  | PG | HP |  
  | EQ | 
  1967 | Camaro | 396  | 350 | at | TH |  
  | ET | 
  1968 | Chevelle | 396  | 325  | TH |   |  
  | ET | 
  1967 | Chevelle | 396  | 325  | TH |   |  
  | EU | 
  1968 | Chevelle | 396  | 350 | TH | HP |  
  | EU | 
  1967 | Chevelle | 396  | 350 | TH | HP |  
  | EV | 
  1967 | Chevelle | 396  | 350 | TH | HP |  
  | EW | 
  1967 | Chevelle | 396  | 350 | TH | HP |  
  | EX | 
  1967 | Chevelle | 396  | 375  | Mt | SHP |  
  | EY | 
  1967 | Camaro | 396  | 350 |   | HP AR |  
  | IA | 
  1965 | Chevrolet | 396  | 325  | Mt |   |  
  | IA | 
  1968 | Chevrolet | 427  | 425  | Mt | SPH |  
  | IA | 
  1967 | Chevrolet | 396  | 325  | Mt |   |  
  | IA | 
  1968 | Chevrolet | 395  | 325  | Mt |   |  
  | IA | 
  1966 | Chevrolet | 396  | 325  | Mt |   |  
  | IB | 
  1968 | Chevrolet | 427  | 385  | TH | Police |  
  | IB | 
  1966 | Chevrolet | 396  | 325  | Mt |   |  
  | IB | 
  1967 | Chevrolet | 396  | 325  | Mt | AR |  
  | IC | 
  1966 | Chevrolet | 396  | 325  | PG | AR |  
  | IC | 
  1967 | Chevrolet | 396  | 325  | PG |   |  
  | IC | 
  1965 | Chevrolet | 396  | 325  | Mt | ti |  
  | ID | 
  1968 | Chevrolet | 427  | 425  | Mt | SHP |  
  | ID | 
  1966 | Chevrolet | 427  | 425  | Mt | SHP |  
  | ID | 
  1967 | Chevrolet | 427  | 425  | Mt | SHP |  
  | IE | 
  1965 | Chevrolet | 396  | 425  | Mt | SHP |  
  | IE | 
  1968 | Chevrolet | 427  | 385  | Mt |   |  
  | IE | 
  1967 | Chevrolet | 427  | 385  | Mt | Impala SS |  
  | IF | 
  1965 | Corvette | 396  | 425  | Mt |   |  
  | IF | 
  1968 | Chevrolet | 396  | 325  | TH | Police |  
  | IF | 
  1967 | Chevrolet | 427  | 385  | TH | AR Impala SS |  
  | IG | 
  1968 | Chevrolet | 396  | 325  | PG |   |  
  | IG | 
  1965 | Chevrolet | 396  | 325  | PG |   |  
  | IG | 
  1967 | Chevrolet | 396  | 325  | PG | AR |  
  | IG | 
  1966 | Chevrolet | 396  | 325  | PG |   |  
  | IH | 
  1966 | Chevrolet | 427  | 390  | Mt |   |  
  | IH | 
  1968 | Chevrolet | 427  | 385  | Mt |   |  
  | IH | 
  1967 | Chevrolet | 427  | 385  | Mt | AR |  
  | II | 
  1967 | Chevrolet | 427  | 385  | Mt | AR |  
  | II | 
  1966 | Chevrolet | 427  | 390  | Mt | AR |  
  | II | 
  1965 | Chevrolet | 396  | 325  | PG | ti |  
  | IJ | 
  1968 | Chevrolet | 427  | 385  | TH |   |  
  | IJ | 
  1966 | Chevrolet | 427  | 390  | TH |   |  
  | IJ | 
  1967 | Chevrolet | 427  | 385  | TH | AR |  
 
  
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