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C3 Corvette Engine Identification Codes

1968 Corvette Engine Identification Codes

Engine Code Cubic Inches Order Code HP Applicable Equipment
HE 327 Base 300 Rochester Q-jet & Manual Transmission
HO 327 Base 300 Rochester Q-jet & Turbo Hydra-Matic
HP 327 L79 350 Rochester Q-jet, A/C, P/S & Manual Transmission
HT 327 L79 350 Rochester Q-jet, Special Cam & 4-Speed
IL 427 L36 390 Rochester Q-jet, Hydraulic Lifters & 4 Speed
IQ 427 L36 390 Rochester Q-jet, Hydraulic Lifters & Turbo Hydra-Matic
IM 427 L68 400 L36 Engine with Holley 3x2BC & 4-Speed
IO 427 L68 400 L36 Engine with Holley 3x2BC & Turbo Hydra-Matic
IR 427 L71 435 Holley 3x2BC, Mechanical Lifters & 4-Speed
IU 427 L89 435 L71 Engine with Aluminum Heads & 4-Speed
IT 427 L88 430 Holley 1x4BC, Heavy-Duty Engine & M22 4-Speed

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1969 Corvette Engine Identification Codes

Engine Code Cubic Inches Order Code HP Applicable Equipment
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, A/C & 4-Speed
GD 350 L46 350 Rochester Q-jet, Special Cam, A/C, K66 & 4-Speed
LM 427 L36 390 Rochester Q-jet, Hydraulic Lifters & 4-Speed
LL 427 L36 390 Rochester Q-jet, Hydraulic Lifters & Turbo Hydra-Matic
LQ 427 L68 400 L36 Engine with Holley 3x2BC & 4-Speed
LN 427 L68 400 L36 Engine with Holley 3x2BC & Turbo Hydra-Matic
LO 427 L88 430 Holley 1x4BC, Heavy-Duty Engine & M22 4-Speed
LV 427 L88 430 Holley 1x4BC, Heavy-Duty Engine & Turbo Hydra-Matic
LR 427 L71 435 Holley 3x2BC, Mechanical Lifters & 4-Speed
LX 427 L71 435 Holley 3x2BC, Mechanical Lifters & Turbo Hydra-Matic
LP 427 L89 435 L71 Engine with Aluminum Heads & 4-Speed
LW 427 L89 435 L71 Engine with Aluminum Heads & Turbo Hydra-Matic
LT 427 L71 435 Holley 3x2BC, Mechanical Lifters, MA6 & 4-Speed
LU 427 L89 435 L71 Engine with Aluminum Heads, MA6 & 4-Speed
ME 427 ZL1 430 ZL1 Performance Package (L88 Engine) & M22 4-Speed
MG 427 ZL1 430 ZL1 Perf Package (L88 Engine) & M22 Turbo Hydra-Matic
MH 427 L36 390 Rochester Q-jet, K66 & 4-Speed
MI 427 L36 390 Rochester Q-jet, K66 & Turbo Hydra-Matic
MJ 427 L68 400 L36 Engine with Holley 3x2BC, K66 & Turbo Hydra-Matic
MK 427 L68 400 L36 Engine with Holley 3x2BC, K66 & 4-Speed
MS 427     Central Office Production Order, Details Unknown
MR 427 L88 430 Holley 1x4BC, Heavy-Duty Engine & M22 4-Speed
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1970 Corvette Engine Identification Codes

Engine Code Cubic Inches Order Code HP Applicable Equipment
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 L46 350 Rochester Q-jet, Performance Cam & 4-Speed
CTH 350 L46 350 Rochester Q-jet, Performance Cam & 4-Speed
CTO 350 L46 350 Rochester Q-jet, Performance Cam, A/C & 4-Speed
CTJ 350 L46 350 Rochester Q-jet, Performance Cam, A/C & 4-Speed
CTP 350 L46 350 Rochester Q-jet, Performance Cam, T/I & 4-Speed
CTQ 350 L46 350 Rochester Q-jet, Performance Cam, A/C, T/I & 4-Speed
CTU 350 LT1 370 Holley 1x4BC, Mechanical Lifters, T/I & 4-Speed
CTK 350 LT1 370 Holley 1x4BC, Mechanical Lifters, T/I & 4-Speed
CTV 350 ZR1 370 Performance Package (LT1 Engine) & M22 4-Speed
CZU 454 LS5 390 Rochester Q-jet, Hydraulic Lifters & 4-Speed
CGW 454 LS5 390 Rochester Q-jet, Hydraulic Lifters & Turbo Hydra-Matic
CRI 454 LS5 390 Rochester Q-jet, Hydraulic Lifters, T/I & 4-Speed
CRJ 454 LS5 390 Rochester Q-jet, Hydraulic Lifters, T/I & Turbo Hydra-Matic
CZL 454 LS7* 465 Holley 1x4BC, Mechanical Lifters, Aluminum Heads & 4-Speed
CZN 454 LS7* 465 Holley 1x4BC, Mechanical Lifters, Aluminum Heads & THM

* Records indicate none were produced

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1971 Corvette Engine Identification Codes

Engine Code Cubic Inches Order Code HP Applicable Equipment
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
CGY 350 ZR1 330 Performance Package (LT1 Engine) & M22 4-Speed
CPH 454 LS5 365 Rochester Q-jet, Hydraulic Lifters & 4-Speed
CPJ 454 LS5 365 Rochester Q-jet, Hydraulic Lifters & Turbo Hydra-Matic
CPW 454 LS6 425 Holley 1x4BC, Mechanical Lifters, Aluminum Heads & 4-Speed
CPX 454 LS6 425 Holley 1x4BC, Mechanical Lifters, Aluminum Heads & THM
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1972 Corvette Engine Identification Codes

Engine Code Cubic Inches Order Code HP Applicable Equipment
CKW 350 Base 200 Rochester Q-jet & 4-Speed
CDH 350 Base 200 Rochester Q-jet, NB2 & 4-Speed
CKX 350 Base 200 Rochester Q-jet & Turbo Hydra-Matic
CDJ 350 Base 200 Rochester Q-jet, NB2 & Turbo Hydra-Matic
CKY 350 LT1 255 Holley 1x4BC, Mechanical Lifters & 4-Speed
CRT 350 LT1 255 Holley 1x4BC, Mechanical Lifters, K19 & 4-Speed
CKZ 350 ZR1 255 Performance Package (LT1 Engine) & M22 4-Speed
CPH 454 LS5 270 Rochester Q-jet, Hydraulic Lifters & 4-Speed
CPJ 454 LS5 270 Rochester Q-jet, Hydraulic Lifters & Turbo Hydra-Matic
CSR 454 LS5 270 Rochester Q-jet, Hydraulic Lifters, K19 & 4-Speed
CSS 454 LS5 270 Rochester Q-jet, Hydraulic Lifters, K19 & Turbo Hydra-Matic
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1973 Corvette Engine Identification Codes

Engine Code Cubic Inches Order Code HP Applicable Equipment
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 250 Turbo Hydra-Matic 400 (California)
CLR 350 L82 250 4-Speed
CLS 350 L82 250 4-Speed (California)
CWM 454 LS4 275 4-Speed
CWR 454 LS4 275 Turbo Hydra-Matic 400
CWS 454 LS4 275 Turbo Hydra-Matic 400 (California)
CWT 454 LS4 275 4-Speed (California)
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1974 Corvette Engine Identification Codes

Engine Code Cubic Inches Order Code HP Applicable Equipment
CKZ 350 L48 195 4-Speed
CLA 350 L48 195 Turbo Hydra-Matic 400
CLB 350 L48 195 4-Speed (California)
CLC 350 L48 195 Turbo Hydra-Matic 400 (California)
CLD 350 L82 250 Turbo Hydra-Matic 400
CLH 350 L82 250 Turbo Hydra-Matic 400 (California)
CLR 350 L82 250 4-Speed
CLS 350 L82 250 4-Speed (California)
CWM 454 LS4 270 4-Speed
CWR 454 LS4 270 Turbo Hydra-Matic 400
CWS 454 LS4 270 Turbo Hydra-Matic 400 (California)
CWT 454 LS4 270 4-Speed (California)
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1975 Corvette Engine Identification Codes

Engine Code Cubic Inches Order Code HP Applicable Equipment
CHA 350 L48 165 4-Speed (Federal Emissions)
CHB 350 L48 165 Turbo Hydra-Matic 400 (Federal Emissions)
CHC 350 L82 205 4-Speed (Federal Emissions)
CHR 350 L82 205 Turbo Hydra-Matic 400 (Federal Emissions & California)
CHU 350 L48 165 4-Speed (Federal Emissions)
CHZ 350 L48 165 Turbo Hydra-Matic 400 (California Emissions)
CKC 350 L82 205 Turbo Hydra-Matic 400 (Federal Emissions)
CRJ 350 L48 165 4-Speed (Federal Emissions)
CRK 350 L48 165 Turbo Hydra-Matic 400 (Federal) Emissions
CRL 350 L82 205 4-Speed (Federal Emissions)
CRM 350 L82 205 Turbo Hydra-Matic 400 (Federal Emissions)
CUA 350 L48 165 4-Speed (Federal Emissions)
CUB 350 L48 165 4-Speed (Federal Emissions)
CUD 350 L82 205 4-Speed (Federal Emissions)
CUT 350 L82 205 4-Speed (Federal Emissions)
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1976 Corvette Engine Identification Codes

Engine Code Cubic Inches Order Code HP Applicable Equipment
CHC 350 L82 210 4-Speed (Federal Emissions)
CKC 350 L82 210 Turbo Hydra-Matic 400 (Federal Emissions)
CKW 350 L48 180 4-Speed (Federal Emissions)
CKX 350 L48 180 Turbo Hydra-Matic 350 (Federal Emissions)
CLM 350     Unverified
CLR 350     Unverified
CLS 350 L48 180 Turbo Hydra-Matic 350 (California Emissions)
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1977 Corvette Engine Identification Codes

Engine Code Cubic Inches Order Code HP Applicable Equipment
CHD 350 L48 180 Turbo Hydra-Matic 350 (California Emissions)
CKD 350 L48 180 Turbo Hydra-Matic 350 (High Altitude)
CKZ 350 L48 180 4-Speed (Federal Emissions)
CLA 350 L48 180 Turbo Hydra-Matic 350 (Federal Emissions)
CLB 350 L48 180 Turbo Hydra-Matic 350 (High Altitude)
CLC 350 L48 180 Turbo Hydra-Matic 350 (California Emissions)
CLD 350 L82 210 4-Speed (Federal Emissions)
CLF 350 L82 210 Turbo Hydra-Matic 400 (California Emissions)
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1978 Corvette Engine Identification Codes

Engine Code Cubic Inches Order Code HP Applicable Equipment
CHW 350 L48 185 4-Speed (Federal Emissions)
CLM 350 L48 185 Turbo Hydra-Matic 350 (Federal Emissions)
CLR 350 L48 175 Turbo Hydra-Matic 350 (California Emissions)
CLS 350 L48 175 Turbo Hydra-Matic 350 (High Altitude)
CMR 350 L82 220 4-Speed (Federal Emissions)
CMS 350 L82 220 Turbo Hydra-Matic 350 (Federal Emissions)
CUT 350 L48 185 Turbo Hydra-Matic 350 (Federal Emissions)
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1979 Corvette Engine Identification Codes

Engine Code Cubic Inches Order Code HP Applicable Equipment
ZAA 350 L48 195 4-Speed (Federal Emissions - Early)
ZAB 350 L48 195 Turbo Hydra-Matic 350 (Federal Emissions - Early)
ZAC 350 L48 195 Turbo Hydra-Matic 350 (California Emissions - Early)
ZAD 350 L48 195 Turbo Hydra-Matic 350 (High Altitude)
ZAF 350 L48 195 4-Speed (Federal Emissions)
ZAH 350 L48 195 Turbo Hydra-Matic 350 (Federal Emissions)
ZAJ 350 L48 295 Turbo Hydra-Matic 350 (California Emissions)
ZBA 350 L82 225 4-Speed (Federal Emissions)
ZBB 350 L82 225 Turbo Hydra-Matic 350 (Federal Emissions)
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1980 Corvette Engine Identification Codes

Engine Code Cubic Inches Order Code HP Applicable Equipment
ZAK 350 L48 190 Turbo Hydra-Matic 350 (Federal Emissions)
ZAM 350 L48 190 4-Speed (Federal Emissions)
ZBC 350 L82 230 Turbo Hydra-Matic 350 (Federal Emissions)
ZBD 350 L82 230 4-Speed (Federal Emissions)
ZCA 305 LG4 180 Turbo Hydra-Matic 350 (California Emissions)
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1981 Corvette Engine Identification Codes

Engine Code Cubic Inches Order Code HP Applicable Equipment
ZDA 350 L81 190 4-Speed (Federal Emissions)
ZDB 350 L81 190 Turbo Hydra-Matic 350 (California Emissions)
ZDC 350 L81 190 4-Speed (California Emissions)
ZDD 350 L81 190 Turbo Hydra-Matic 350 (Federal Emissions)
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1982 Corvette Engine Identification Codes

Engine Code Cubic Inches Order Code HP Applicable Equipment
ZBA 350 L83 200 Turbo Hydra-Matic 700-R4 (Federal Emissions)
ZBC 350 L83 200 Turbo Hydra-Matic 700-R4 (California Emissions - Early)
ZBN 350 L83 200 Turbo Hydra-Matic 700-R4 (California Emissions)
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