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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

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

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Data presented here has been gathered from various websites, knowledgeable car owners and GM's "Information Kits." I have found several differences on numerous websites, particularly in sales quantity and pricing. I have used (what I consider) the more reputable sources and Chevrolet owners for the most accurate information available. Hopefully you will find the layout and how the data are presented acceptable.

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