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1968 - 1982 Corvette Specification Guide
(1968-1982 Engine Identification Codes)

1968 Engine Identification Codes

Engine Code Cubic Inches Order Code H.P. Applicable Equipment
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 Cam & 4-Speed
IL 427 L36 390 Rochester Q-jet, Hydraulic Lifters & 4-Speed
IQ 427 L36 390 Rochester Q-jet, Hydraulic Lifters & THM
IM 427 L68 400 L36 Engine with Holley 3x2BC & 4-Speed
IO 427 L68 400 L36 Engine with Holley 3x2BC & THM
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

Note:  Carburetion is either Rochester Quadrajet single four-barrel; or Holley single four-barrel(1x4) or three two-barrels (3x2).  M22 is Heavy-Duty Four-Speed Transmission; THM means Turbo Hydra-Matic Transmission (M40); A/C means Air Conditioning (C60); P/S means Power Steering (N40).

1969 Engine Identification Codes

Engine Code Cubic Inches Order Code H.P. 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, Hyd. Lifters & Turbo Hydra-Matic
LQ 427 L68 400 L36 Engine with Holley 3x2BC & 4-Speed
LN 427 L68 400 L36 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 & THM
LR 427 L71 435 Holley 3x2BC, Mechanical Lifters & 4-Speed
LX 427 L71 435 Holley 3x2BC, Mechanical Lifters & THM
LP 427 L89 435 L71 Engine with Aluminum Heads & 4-Speed
LW 427 L89 435 L71 Engine with Aluminum Heads & THM
LT 427 L71 435 Holley 3x2BC, Mech. Lifters, MA6 & 4-Speed
LU 427 L89 435 L71 Engine with Alum. Heads MA6 & 4-Speed
ME 427 ZL1 430 ZL1 Perf. Package (L88 Engine) & M22 4-Speed
MG 427 ZL1 430 ZL1 Performance Package (L88 Engine) & THM
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 & THM
MK 427 L68 400 L36 Engine with Holley 3x2BC, K66 &  4-Speed
MS 427 - - COPO, Details Unknown*
MR 427 L88 430 Holley 1x4BC,  Heavy-Duty Engine & M22 4-Speed

Note:  Carburetion is either Rochester Quadrajet single four-barrel; or Holley single four-barrel (1x4) or three two-barrels (3x2).  M22 is Heavy-Duty Four-Speed Transmission; THM means Turbo Hydra-Matic Transmission (M40); A/C means Air Conditioning (C60); P/S means Power Steering (N40). Engines listed with the prefix letter "M" were added during the 1969 model year and indicate K66 Transistorized Ignition equipment.  (*) COPO means Central Office Production Order.

1970 Engine Identification Codes

Engine Code Cubic Inches Order Code H.P. 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, Perf. Cam, T/I & 4-Speed
CTQ 350 L46 350 Rochester Q-jet, Perf. 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 & THM
CRI 454 LS5 390 Rochester Q-jet, Hydraulic Lifters, T/I & 4-Speed
CRJ 454 LS5 390 Rochester Q-jet, Hydraulic Lifters, T/I & THM
CZL 454 LS7** 465 Holley 1x4BC, Mech. Lifters,  Alum. Heads & 4-Speed
CZN 454 LS7** 465 Holley 1x4BC, Mech. Lifters,  Alum. Heads & THM

Note:  Carburetion is either Rochester Quadrajet single four-barrel; or Holley single four-barrel (1x4).  M22 is Heavy-Duty Four-Speed Transmission; THM means Turbo Hydra-Matic Transmission (M40); A/C means Air Conditioning (C60); T/I means Transistor Ignition.  Engine code with an asterisk (*) indicate the new code introduced during the 1970 model year, replacing the earlier listed code; (**) LS7 listing is for information only; records indicate none were produced for retail sale.  A "CTR" engine code (LT1 with T/I) has appeared in print, but records indicate it was not used, and is unverified.

1971 Engine Identification Codes

Engine Code Cubic Inches Order Code H.P. 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 & THM
CPW 454 LS6 425 Holley 1x4BC, Mech. Lifters, Alum. Heads & 4-Spd
CPX 454 LS6 425 Holley 1x4BC, Mech. Lifters, Alum. Heads & THM

Note:  Carburetion is either Rochester Quadrajet single four-barrel; or Holley single four-barrel (1x4).  M22 is Heavy-Duty Four-Speed Transmission; THM means Turbo Hydra-Matic Transmission (M40).  Engine code "CJK" with an asterisk (*) indicates a new code during the 1971 model year, replacing the earlier listed "CGT" code.

1972 Engine Identification Codes

Engine Code Cubic Inches Order Code H.P. 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 & THM
CSR 454 LS5 270 Rochester Q-jet, Hyd. Lifters, K19 & 4-Speed
CSS 454 LS5 270 Rochester Q-jet, Hyd. Lifters, K19 & THM

Note:  Carburetion is either Rochester Quadrajet single four-barrel; or Holley single four-barrel (1x4).  M22 is Heavy-Duty Four-Speed Transmission; THM means Turbo Hydra-Matic Transmission (M40); NB2 equipment was required on California bound 1972 Corvettes and consisted of an Air Injection Reactor (K19) system and different camshaft with no longer valve overlap.

1973 Engine Identification Codes

Engine Code Cubic Inches Order Code Engine Horsepower 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)

1974 Engine Identification Codes

Engine Code Cubic Inches Order Code Engine Horsepower 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 (Federal & some California)
CLH 350 L82 250 Turbo Hydra-Matic 400 (California)
CLR 350 L82 250 4-Speed (Federal & some California)
CLS 350 L82 250 4-Speed (California)
CWM 454 LS4 270 4-Speed (Federal & some California)
CWR 454 LS4 270 Turbo Hydra-Matic 400
CWS 454 LS4 270 Turbo Hydra-Matic 400 (California)
CWT 454 LS4 270 4-Speed (California)

1975 Engine Identification Codes

Engine Code Cubic Inches Order Code Engine Horsepower Applicable Equipment
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*)
CHZ 350 L48 165 Turbo Hydra-Matic 400 (California)
CKC 350 L82 205 Turbo Hydra-Matic 400 (Federal)
CRJ 350 L48 165 4-Speed (Federal*)
CRK 350 L48 165 Turbo Hydra-Matic 400 (Federal)
CRL 350 L82 205 4-Speed (Federal*)
CRM 350 L82 205 Turbo Hydra-Matic 400 (Federal)
CUA 350 L48 165 4-Speed (Federal*)
CUB 350 L48 165 4-Speed (Federal*)
CUD 350 L82 205 4-Speed (Federal*)
CUT 350 L82 205 4-Speed (Federal*)

Note: (*) 1975 four-speed transmission equipped Corvettes were prefaced by Chevrolet as "Federal" with regard to emissions status, however these engines may also have met compliance in California.

1976 Engine Identification Codes

Engine Code Cubic Inches Order Code H.P. Applicable Equipment
CHC 350 L82 210 4-Speed (Federal)
CKC 350 L82 210 Turbo Hydra-Matic 400 (Federal)
CKW 350 L48 180 4-Speed (Federal)
CKX 350 L48 180 Turbo Hydra-Matic 350 (Federal)
CLM 350 - - Unverified
CLR 350 - - Unverified
CLS 350 L48 180 Turbo Hydra-Matic 350 (California)

1977 Engine Identification Codes

Engine Code Cubic Inches Order Code H.P. Applicable Equipment
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 350 (Hi-Altitude)
CLC* 350 L48 180 Turbo Hydra-Matic 350 (California)
CLD 350 L82 210 4-Speed (Federal)
CLF 350 L82 210 Turbo Hydra-Matic 400 (Federal)

Note:  (*) "CLB" and "CLC" engines were cancelled early in 1977 model production.

1978 Engine Identification Codes

Engine Code Cubic Inches Order Code H.P. Applicable Equipment
CHW 350 L48 185 4-Speed (Federal)
CLM 350 L48 185 Turbo Hydra-Matic 350 (Federal)
CLR 350 L48 175 Turbo Hydra-Matic 350 (California)
CLS 350 L48 175 Turbo Hydra-Matic 350 (Hi-Altitude)
CMR 350 L82 220 4-Speed (Federal)
CMS 350 L82 220 Turbo Hydra-Matic 350 (Federal)
CUT 350 L48 185 Turbo Hydra-Matic 350 (Federal)

1979 Engine Identification Codes

Engine Code Cubic Inches Order Code H.P. Applicable Equipment
ZAA 350 L48 195 4-Speed (Federal-early)
ZAB 350 L48 195 Turbo Hydra-Matic 350 (Federal-early)
ZAC 350 L48 195 Turbo Hydra-Matic 350 (California-early)
ZAD 350 L48 195 Turbo Hydra-Matic 350 (Hi-Altitude)
ZAF 350 L48 195 4-Speed (Federal)
ZAH 350 L48 195 Turbo Hydra-Matic 350 (Federal)
ZAJ 350 L48 195 Turbo Hydra-Matic 350 (California)
ZBA 350 L82 225 4-Speed (Federal)
ZBB 350 L82 225 Turbo Hydra-Matic 350 (Federal)

1980 Engine Identification Codes

Engine Code Cubic Inches Order Code H.P. Applicable Equipment
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)

1981 Engine Identification Codes

Engine Code Cubic Inches Order Code H.P. Applicable Equipment
ZDA 350 L81 190 4-Speed (Federal)
ZDB 350 L81 190 Turbo Hydra-Matic 350 (California)
ZDC 350 L81 190 4-Speed (California)
ZDD 350 L81 190 Turbo Hydra-Matic 350 (Federal)

1982 Engine Identification Codes

Engine Code Cubic Inches Order Code H.P. Applicable Equipment
ZBA 350 L83 200 Turbo Hydra-Matic 700-R4 (Federal)
ZBC 350 L83 200 Turbo Hydra-Matic 700-R4 (California-early)
ZBN 350 L83 200 Turbo Hydra-Matic 700-R4 (California)


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