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Chevrolet V8 Engine ID Codes

1968

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Model Model No. CID H.P. (RPO Code) Trans/Options Suffix
Passenger 154/156/164/16600 307  200 (RPO L14) 3-speed and overdrive DO
        4-speed, H.D. Chassis DP
        H.D. Clutch DQ
        Powerglide DR
        Turbo Hydra-Matic DS
    327 275 (RPO L30) Manual HA
        H.D. Clutch HB
        Powerglide HC
        Turbo Hydra-Matic HF
      250 (RPO L73) Manual HI
        Powerglide HJ
        H.D. Clutch HL
        Turbo Hydra-Matic HM
        Powerglide, regular fuel HN
    396 325 (RPO L35) Manual IA
        Turbo Hydra-Matic IF
        Powerglide IG
        3-speed, Police IK
        Powerglide, Police IN
        Turbo Hydra-Matic IV
    427 390 (RPO L36) Turbo Hydra-Matic, Police IB
        3-speed, Police IC
      425 (RPO L72) S.H.P. ID
      390 Manual IE, IH
        Turbo Hydra-Matic IJ, IS
           
Corvette 19400 327 300 Manual HE
        Turbo Hydra-Matic HO
        Manual, A.C., P.S. HP
      350 (RPO L79) 4-speed, special camshaft HT
    427 390 (RPO L36) 4-speed, hydraulic camshaft IL
        Turbo Hydra-Matic, hydraulic camshaft IQ
      400 (RPO L68) 4-speed, 3x2 Holley IM
        Turbo Hydra-Matic, 3x2 Holley IO
      430 (RPO L88) 4-speed, Holley, S.H.P. IT
      435 (RPO L71) 4-speed, mechanical camshaft, 3x2 Holley IR
        4-speed, mechanical camshaft, 3x2 Holley, aluminum heads IU
           
Chevy II/Nova 11400 307 200 (RPO L14) 3-speed or Overdrive DA
        4-speed DB
        Powerglide DE
    327 275 (RPO L30) Manual EA, MK
        Powerglide EE, MM
      325 (RPO L79) 3-, 4-speed, S.H.P. EP, ML
    350 295 (RPO L48) Manual MS
        Powerglide MU
    396 375 (RPO L78) Manual, S.H.P. MQ
        Turbo Hydra-Matic MR
      350 (RPO L34) Manual MX
           
Chevelle 132/134/136/13800 307 200 (RPO L14) 3-speed or Overdrive DA
        4-speed DB
        Powerglide DE
        H.D. Clutch DN
    327 275 (RPO L30) Manual EA
        Powerglide EE
        Powerglide EC (1)
      250 (RPO L73) Manual EH
        Powerglide EI
        H.D. Clutch EJ
      275 H.D. Clutch EO
      325 (RPO L79) Manual, S.H.P. EP
        H.D. Clutch, S.H.P. ES
    396 325 (RPO L35) Manual, A.I.R. ED
      350 (RPO L34) Manual, A.I.R. EF
      375 (RPO L78) Manual, S.H.P., A.I.R. EG
      325 Powerglide, c.c.s.  
      350 Powerglide, A.I.R. EL
      325 Turbo Hydra-Matic, C.C.S. ET
      350 Turbo Hydra-Matic, A.I.R. EU
           
Camaro 12400 302 290 (part of RPO Z28) 4-speed, S.H.P.. A.I.R. MO
    327 210 Manual MA
        Powerglide / Turbo Hydra-Matic 350 ME/MI2
      275 (RPO L30) Manual EA
        Powerglide / Turbo Hydra-Matic 350 EE/EN2
    350 295 (RPO L48) Manual MS
        Powerglide / Turbo Hydra-Matic 350 MU/MF2
    396 325 (RPO L35) Manual MW
        Turbo Hydra-Matic MR
      355 (RPO L34) Manual MX
        Turbo Hydra-Matic MR
      375 (RPO L78) Manual MQ
        Manual with L89 Aluminum Head Option MT


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A.C. - Air Conditioning
A.I.R. - Air Injection Reactor
C.C.S. - Controlled Combustion System
H.D. - H.D.
P.S. - Power Steering
S.H.P. - Special High Performance

(1) "EC" code added to 327/275 hp engine with Powerglide due to the addition of a cooler line clip added to the pan rail.
(2) Engine code with Turbo Hydra-Matic 350 used in late-year 1968 Turbo Hydra-Matic 350 test fleet

 

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1968 Chevelle 327/325 Horsepower RPO L79
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1968 Chevelle 396/325 Horsepower RPO L35 w/automatic and C.C.S.
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1968 Chevelle 396/350 Horsepower RPO L34
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1968 Chevelle 396/375 Horsepower RPO L78