1953-1962 Corvette Intake Manifold Casting Numbers

1953-1955 Number Metal Engine 3707064 Aluminum Six-Cylinder 53-55 3711348 Cast Iron 1955 V-8 Note: Original 1953-55 six-cylinder intake manifold carries no casting number; later service replacement manifold carries the casting number listed and a Winter’s Foundry “snowflake” vendor’s logo. 1956 … Continue reading

1963-1967 Corvette Rear Axle Codes and Ratios

1963-1964 Code Ratio Type CA 3.36:1 Standard Manual Transmission or Powerglide CB 3.36:1 Positraction Manual Transmission or Powerglide CC 3.55:1 Positraction 4-Speed CD 3.70:1 Positraction 4-Speed CE 4.11:1 Positraction 4-Speed CF 4.56:1 Positraction 4-Speed CJ 3.08:1 Positraction 4-Speed CX 3.70:1 … Continue reading

1962 Corvette Rear Axle Codes and Ratios

1962 Code Ratio Type CA 3.36:1 Standard Manual Transmission or Powerglide CB 3.36:1 Positraction Manual Transmission or Powerglide CC 3.55:1 Positraction 4-Speed CD 3.70:1 Positraction 4-Speed CE 4.11:1 Positraction 4-Speed CF 4.56:1 Positraction 4-Speed CG 3.70:1 Standard 4-Speed CX 3.70:1 … Continue reading

1961 Corvette Rear Axle Codes and Ratios

1961 Code Ratio Type AC 3.36:1 Standard 3-Speed AE 3.55:1 Standard Powerglide AH 3.70:1 Standard 4-Speed AN 3.70:1 Positraction Manual Transmission AP 4.11:1 Positraction Manual Transmission AQ 4.56:1 Positraction Manual Transmission AF 3.36:1 Positraction Manual Transmission AS 3.70:1 Positraction 4-Speed … Continue reading

1957-1960 Corvette Rear Axle Codes and Ratios

1957-1958 Code Ratio Type AE 3.36:1 Standard Powerglide AH 3.70:1 Standard Manual Transmission AN 3.70:1 Positraction Manual Transmission AP 4.11:1 Positraction Manual Transmission AQ 4.56:1 Positraction Manual Transmission AS 3.70:1 Positraction Manual Trans. & H.D. Brakes & Suspension AT 4.11:1 … Continue reading

1968-1970 Corvette Rear Axle Codes and Ratios

1968-1969 Code Ratio Type AK 3.36:1 Standard (327/350) AL 3.08:1 Positraction (327/350) AM 3.36:1 Positraction (327/350) AN 3.55:1 Positraction (327/350) AO 3.70:1 Positraction (327/350) AP 4.11:1 Positraction (327/350) AS 3.70:1 Standard (327/350) AT 3.08:1 Heavy Duty Positraction (427) AU 3.36:1 … Continue reading

1980-1982 Corvette Engine Block Codes

1980 Code Number Engine ZAK 350 L48 190 Turbo Hydra-Matic 350 (Federal) ZAM 350 L48 190 4-Speed (Federal) ZBC 350 L82 230 Turbo Hydra-Matic 350 (Federal) ZBD 350 L82 230 4-Speed (Federal) ZCA 305 LG4 180 Turbo Hydra-Matic 350 (California) … Continue reading

1977-1979 Corvette Engine Block Codes

1977 Code Number Engine CHD 350 L48 180 Turbo Hydra-Matic 350 (California) CKD 350 L48 180 Turbo Hydra-Matic 350 (Hi-Altitude) CKZ 350 L48 180 4-Speed (Federal) CLA 350 L48 180 Turbo Hydra-Matic 350 (Federal) CLB 350 L48 180 Turbo Hydra-Matic … Continue reading

1975-1976 Corvette Engine Block Codes

1975 Code Number Engine CHA 350 L48 165 4-Speed (Federal*) CHB 350 L48 165 Turbo Hydra-Matic 400 (Federal) CHC 350 L82 205 4-Speed (Federal*) CHR 350 L82 205 Turbo Hydra-Matic 400 (Federal & California) CHU 350 L48 165 4-Speed (Federal*) … Continue reading

1973-1974 Corvette Engine Block Codes

1973 Code Number Engine CKZ 350 L48 190 4-Speed CLA 350 L48 190 Turbo Hydra-Matic 400 CLB 350 L48 190 4-Speed (California) CLC 350 L48 190 Turbo Hydra-Matic 400 (California) CLD 350 L82 250 Turbo Hydra-Matic 400 CLH 350 L82 … Continue reading

1971-1972 Corvette Engine Block Codes

1971 Code Number Engine CJL 350 Base 270 Rochester Q-jet & 4-Speed CGT 350 Base 270 Rochester Q-jet & Turbo Hydra-Matic CJK 350 Base 270 Rochester Q-jet & Turbo Hydra-Matic CGZ 350 LT1 330 Holley 1x4BC, Mechanical Lifters, & 4-Speed … Continue reading

1970 Corvette Engine Block Codes

1970 Code Number Engine CTL 350 Base 300 Rochester Q-jet & 4-Speed CTD 350 Base 300 Rochester Q-jet & 4-Speed CTM 350 Base 300 Rochester Q-jet & Turbo Hydra-Matic CTG 350 Base 300 Rochester Q-jet & Turbo Hydra-Matic CTN 350 … Continue reading

1969 Corvette Engine Block Codes

1969 Code Number Engine HY 350 Base 300 Rochester Q-jet & Manual Transmission HZ 350 Base 300 Rochester Q-jet & Turbo Hydra-Matic HW 350 L46 350 Rochester Q-jet, Special Cam & 4-Speed HX 350 L46 350 Rochester Q-jet, Special Cam, … Continue reading

1968 Corvette Engine Block Codes

1968 Code Number Engine HE 327 Base 300 Rochester Q-jet & Manual Transmission HO 327 Base 300 Rochester Q-jet & Turbo Hydra-Matic HP 327 Base 300 Rochester Q-jet, A/C, P/S & Manual Transmission HT 327 L79 350 Rochester Q-jet, Special … Continue reading

1967 Corvette Engine Block Codes

1967 Code Number Engine HE 327 Base 300 1x4BC & Manual Transmission HH 327 Base 300 1x4BC, K19 & Manual Transmission HO 327 Base 300 1x4BC & Powerglide HR 327 Base 300 1x4BC, K19 & Powerglide HP 327 Base 300 … Continue reading