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Chevrolet V8 Engine ID Codes

1966

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Model	Model No.	CID	H.P. (RPO Code)	Trans/Options	Suffix
Passenger	154/156/164/16600	283	195	Manual	GA
				Manual, R.H.D.	GB
				3-speed, police	GC
				Manual, low compression	GD
				Manual, low compression, RHD	GE
				Powerglide	GF
				Powerglide, low compression	GG
				Powerglide, RHD	GH
				Powerglide, low compression, RHD	GI
				Manual, A.I.R.	GK
			220 (RPO L77)	Powerglide, 4-bbl	GL
			195	4-speed, A.I.R.	GS
				Powerglide, A.I.R.	GT
				H.D. Clutch	GU
			220	H.D. Clutch	GV
				Manual, 4-bbl	GW
				Manual, 4-bbl, A.I.R.	GX
				Powerglide, 4-bbl, A.I.R.	GZ
		327	275 (RPO L30)	Manual, Holley 4-bbl	HAH
				A.I.R.	HB
				Powerglide, Holley 4-bbl	HCH
				Powerglide, Rochester 4-bbl	HCR
				Powerglide, A.I.R.	HF
				H.D. Clutch	KE
		396	325 (RPO L35)	H.D. 3-speed or 4-speed, Holley 4-bbl	IAH
				H.D. 3-speed or 4-speed, Rochester 4-bbl	IAR
				H.D. 3-speed or 4-speed, A.I.R.	IB
				Powerglide, A.I.R.	IC
				Powerglide, Holley 4-bbl	IGH
				Powerglide, Rochester 4-bbl	IGR
				Turbo Hydra-Matic, A.I.R.	IN
				Turbo Hydra-Matic, Holley 4-bbl	IVH
				Turbo Hydra-Matic, Rochester 4-bbl	IVR
		427	425 (RPO L72)	Manual, S.H.P.	ID
			390 (RPO L36)	H.D. 3-speed or 4-speed	IH
				H.D. 3-speed or 4-speed, A.I.R.	II
				Turbo Hydra-Matic	IJ
				Turbo Hydra-Matic, A.I.R.	IO

Corvette	19437/19467	327	300	Manual	HE
				Manual, A.I.R.	HH
				Powerglide	HO
				Powerglide, A.I.R.	HR
			350 (RPO L79)	4-speed, H-lift camshaft, A.I.R.	HD
				4-speed, H-lift camshaft, A.C., P.S.	H.P.
				4-speed, H-lift camshaft	HT
				4-speed, H-lift camshaft, A.I.R., A.C., P.S.	KH
		427	390 (RPO L36)	4-speed, Hydraulic Lifters, Special Cam	IL
				4-speed, Hydraulic Lifters, Special Cam, A.I.R.	IM
				Powerglide, Hydraulic Lifters, Special Cam	IQ
				Powerglide, Hydraulic Lifters, Special Cam, A.I.R.	IR
			425 (RPO L72)	M22 4-speed, Special Cam, Mechanical Lifters	IK
				4-speed, Special Cam, Mechanical Lifters	IP
				M22 4-speed, Special Cam, Mechanical Lifters - H.D.	IT
				M22 4-speed, Special Cam, Mechanical Lifters - Aluminum Heads	IU

Chevy II/Nova	114/116/11800	283	220 (RPO L77)	Powerglide, A.C.	PB
			195	3-speed	PD
				3-speed, A.I.R.	PE
				3-speed, A.C.	PF
				3-speed, A.I.R., A.C.	PG
			220	Powerglide, 4-bbl	PK
			195	4-speed	PL
				4-speed, A.C.	PM
				Powerglide	PN
				Powerglide, A.I.R., A.C.	PO
				Powerglide, A.C.	PP
				4-speed, A.I.R.	PQ
				4-speed, A.I.R., A.C.	PS
				Powerglide, A.I.R.	PU
			220	Manual, 4-bbl	QA
				Manual, 4-bbl, A.C.	QB
				Manual, 4-bbl, A.I.R.	QC
				Powerglide, 4-bbl, A.I.R.	QD
				Powerglide, 4-bbl, A.I.R., A.C.	QE
				Manual, 4-bbl, A.I.R., A.C.	QF
		327	275 (RPO L30)	Manual	ZA
				A.I.R.	ZB
				A.I.R., A.C.	ZC
				Powerglide, A.I.R.	ZD
				Manual, A.C.	ZE
				Powerglide, A.I.R., A.C.	ZF
			350 (RPO L79)	A.I.R., S.H.P.	ZG
				A.I.R., A.C., S.H.P.	ZH
			350	Manual, S.H.P.	ZI
				Manual, A.C., S.H.P.	ZJ
			275	Powerglide	ZK
			275	Powerglide, A.C.	ZM

Chevelle	132/134/136/13800	283	195	3-speed or Overdrive	DA
				4-speed	DB
				Powerglide	DE
			220 (RPO L77)	3- and 4-speed, 4-bbl	DG
				Powerglide, 4-bbl	DH
			195	3-speed or Overdrive, A.I.R.	DI
				Powerglide, A.I.R.	DJ
				4-speed, A.I.R.	DK
			220	Manual, 4-bbl, A.I.R.	DL
				Powerglide, 4-bbl, A.I.R.	DM
			195	H.D. Clutch	DN
			220	H.D. Clutch	DO
		327	275 (RPO L30)	Manual, Holley	EAH
				Manual, A.I.R.	EB
				Powerglide, A.I.R.	EC
				Powerglide	EE
				H.D. Clutch	EO
			350 (RPO L79)	H.D. 3-speed or 4-speed	EP*
				H.D. 3-speed or 4-speed, A.I.R.	ER*
				H.D. 3-speed or 4-speed	ES*
		396	325 (RPO L35)	H.D. 3-speed or 4-speed, Holley	EDH
			360 (RPO L34)	H.D. 3-speed or 4-speed, H.P.	EF
			375 (RPO L78)	H.D. 3-speed or 4-speed, S.H.P.	EG
			325	H.D. 3-speed or 4-speed, A.I.R.	EH
			360	H.D. 3-speed or 4-speed, A.I.R.	EJ
			325	Powerglide, Holley	EKH
			360	Powerglide, H.P.	EL
			325	Powerglide, A.I.R.	EM
			360	Powerglide, A.I.R., H.P.	EN

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* Not available in 1966 Chevelle although engine codes were assigned
A.C. - Air Conditioning
A.I.R. - Air Injection Reactor
COPO - Central Office Production Order
F.I. - Fuel Injection
H.D. - H.D.
H.P. - High Performance
P.S. - Power Steering

R.H.D. - Right-Hand Drive
S.H.P. - Special High Performance

1966 Chevelle 396/325 Horsepower RPO L35

1966 Corvette 427/390 Horsepower RPO L36

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