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Chevrolet V8 Engine ID Codes

1970

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1970	1971	1972
1973	1974	1975

Model	Model No.	CID	H.P. (RPO Code)	Trans/Options	Suffix
Passenger	154/156/164/16600	350	250	Manual	CNO
			300 (RPO L48)	Manual, Police, Taxi	CNP
			250	Manual	CNQ
			300	Turbo Hydra-Matic 350	CNR
				Powerglide, Police, Taxi	CNS
				Turbo Hydra-Matic 350, Police, Taxi	CNT
			250	Powerglide	CNU
				Turbo Hydra-Matic 350	CNV
				Powerglide, Police, Taxi	CNW
				Turbo Hydra-Matic 350, Police, Taxi	CNX
				Low Compression	CNY
				Powerglide, Low Compression	CNZ
		400	265 (RPO LF6)	Turbo Hydra-Matic 350, 400	CGR
		454	345 (RPO L84)	Turbo Hydra-Matic 400, Police, Taxi	CGS
			390 (RPO LS5)	Turbo Hydra-Matic 400, Police, Taxi	CGT
				Turbo Hydra-Matic 400	CGU
			345	Turbo Hydra-Matic 400	CGV

Corvette	19400	350	300	4-speed, Rochester 4-bbl	CTD
				Turbo Hydra-Matic 400, Rochester 4-bbl	CTG *
				4-speed, Rochester 4-bbl	CTL
				Turbo Hydra-Matic 400, Rochester 4-bbl	CTM
			350 (RPO L46)	4-speed, Rochester 4-bbl, Performance Cam	CTH *
				4-speed, Rochester 4-bbl, Performance Cam, A.C.	CTJ *
				4-speed, Rochester 4-bbl, Performance Cam	CTN
				4-speed, Rochester 4-bbl, Performance Cam, A.C.	CTO
				4-speed, Rochester 4-bbl, Performance Cam, T.I.	CTP
				4-speed, Rochester 4-bbl, Performance Cam, A.C., T.I.	CTQ
			370 (RPO LT1)	4-speed, Holley 4-bbl, T.I. (LT1 late)	CTK *
				4-speed, Holley 4-bbl, T.I. (LT1 early)	CTU
		454	390 (RPO LS5)	Turbo Hydra-Matic 400, Rochester 4-bbl, Hydraulic Cam	CGW
				4-speed, Rochester 4-bbl, Hydraulic Cam, T.I.	CRI
			390	Turbo Hydra-Matic 400, Hydraulic Cam	CZU
* Code change during the model year

Nova	11400	307	200	Manual	CNC
				4-speed	CND
				Powerglide	CNE
				Turbo Hydra-Matic 350	CNF
				Low Compression	CNG
				Powerglide, Low Compression	CNH
		350	250 (RPO L65)	Manual	CNI
			300 (RPO L48)	Manual	CNJ
				Powerglide	CNK
			250	Powerglide	CNM
				Turbo Hydra-Matic 350	CNN
			300	Turbo Hydra-Matic 350	CRE
		402	375 (RPO L78)	Manual	CKO
				Manual, H.D. Clutch	CKQ
			350 (RPO L34)	Turbo Hydra-Matic 400	CTW
				Manual	CTX
			375	Turbo Hydra-Matic 400	CTY
			350	Manual, H.D. Clutch	CTZ

Chevelle	132/134/136/13800	307	200	Manual	CNC
				4-speed	CND
				Powerglide	CNE
				Turbo Hydra-Matic 350	CNF
				Low Compression	CNG
				Powerglide, Low Compression	CNH
		350	250 (RPO L65)	Manual	CNI
			300 (RPO L48)	Manual	CNJ
				Powerglide	CNK
			250	Powerglide	CNM
				Turbo Hydra-Matic 350	CNN
			300	Turbo Hydra-Matic 350	CRE
		402	330 (RPO LS3)	Turbo Hydra-Matic 400	CKN
			375 (RPO L78)	4-speed, A.I.R.	CKO
			375	Turbo Hydra-Matic 400, Aluminum heads, A.I.R.	CKP
				H.D. Clutch	CKQ
			330	Manual	CKR
				H.D. Clutch	CKS
			375	4-speed, Aluminum heads, A.I.R.	CKT
				H.D. Clutch, Aluminum heads, A.I.R.	CKU
			350	Turbo Hydra-Matic 400	CTW
				4-speed	CTX
			375	Turbo Hydra-Matic 400, A.I.R.	CTY
			350	H.D. Clutch	CTZ
		454	360 (RPO LS5)	Turbo Hydra-Matic 400	CRQ
			450 (RPO LS6)	Turbo Hydra-Matic 400, A.I.R.	CRR
			360	4-speed	CRT
			450	4-speed, A.I.R.	CRV

Monte Carlo	13800	350	250 (RPO L65)	Manual	CNI
			300 (RPO L48)	Manual	CNJ
			300	Powerglide	CNK
			250	Powerglide	CNM
				Turbo Hydra-Matic 350	CNN
			300	Turbo Hydra-Matic 350	CRE
		400	265 (RPO LF6)	Turbo Hydra-Matic 350	CRH
				Manual	CZX
		402	330 (RPO LS3)	Turbo Hydra-Matic 400	CKN
				Manual	CKR
		454	360 (RPO LS5)	Turbo Hydra-Matic 400	CRN

Camaro	12400	307	200	Manual	CNC
				4-speed	CND
				Powerglide	CNE
				Turbo Hydra-Matic 350	CNF
		350	250 (RPO L65)	Manual	CNI
			300 (RPO L48)	Manual	CNJ
				Powerglide	CNK
			250	Powerglide	CNM
				Turbo Hydra-Matic 350	CNN
			300	Turbo Hydra-Matic 350	CRE
			360 (part of RPO Z28)	Manual	CTB
				Turbo Hydra-Matic 400	CTC
		402	350 (RPO L34)	Manual	CJF
			375 (RPO L78)	Manual	CJH
			350	Turbo Hydra-Matic 400	CJI
			375	Turbo Hydra-Matic 400	CJL
			350	Turbo Hydra-Matic 400	CTW
				Manual	CTX
			375	Turbo Hydra-Matic 400	CTY

A.C. - Air Conditioning A.I.R. - Air Injection Reactor H.D. - Heavy Duty H.P. - High Performance P.S. - Power Steering S.H.P. - Special High Performance

1970 Corvette 350/370 Horsepower RPO LT1			1970 Chevelle 454/450 Horsepower RPO LS6

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