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Appendix C - Part 2/Engine Suffix Codes

(1) - Engine Assembly Process

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1970 250/307/350/402/454 Engine ID Suffix Codes

1970 Code Size (cid) Horsepower Carburetor RPO Transmission
CRF 250 155 1-bbl L22 Manual 3
CCG 250 155 1-bbl L22 Powerglide
CCK 250 155 1-bbl L22 TH350
CCL 250 155 1-bbl L22 Manual 3
CCM 25O 155 1-bbl L22 Powerglide
           
CNC 307 200 2-bbl L14 Manual 3
CND 307 200 2-bbl
 L14 Manual 4
CNE 307 200 2-bbl
 L14 Powerglide
CNF 307 200 2-bbl
 L14 TH350
CNG 307 200 2-bbl
 L14 Low Compression, Manual
CNH 307 200 2-bbl
 L14 Low Compression, Automatic
           
CNI 350 250 2-bbl L65 Manual 3-4
CNJ 350 300 4-bbl L48 Manual 3
CNK 350 300 4-bbl L48 Powerglide
CNM 350 250 2-bbl L65 Powerglide
CNN 350 250 2-bbl L65 TH350
CRE 350 300 4-bbl L48 TH400
           
CGR 402 330 4-bbl LS3 Manual 3-4
CKN 402 375 4-bbl L78 Manual 4
CKP 402 375 4-bbl L78/L89 TH400 (w/aluminum head option)
CKQ 402 375 4-bbl L78 Manual 4
CKR 402 330 4-bbl LS3 Manual 4
CKS 402 330 4-bbl LS3 Manual 4
CKT 402 375 4-bbl L78/L89 Manual 4 (w/aluminum head option)
CKU 402 375 4-bbl L78/L89 Manual 4 (H.D. Clutch/aluminum head option)
CTW 402 350 4-bbl L34 TH400
CTX 402 350 4-bbl L34 Manual 4
CTY 402 375 4-bbl L78 TH400
CTZ 402 350 4-bbl L34 Manual 4
           
CRN * (7) 454 360 4-bbl LS5 TH400 - Monte Carlo Exclusive
CRQ 454 360 4-bbl LS5 TH400
CTT 454 450 4-bbl LS6 TH400
CRT 454 360 4-bbl LS5 Manual 4
CRU 454 360 4-bbl LS5 Manual 4
CRV 454 450 4-bbl LS6 Manual 4
CRX 454 450 4-bbl LS6 Manual 4, H.D. Clutch

Several things should be noted here for 1970:

(1) Several engines were either the base engine for the series/model or option and their respective RPO codes are shown for clarification only. For example, the 250cid engine was the base I6 engine, the 307cid engine was the base V8 engine, the L34and LS5 V8 engines were the base engines for the RPO Z25 SS 396 Equipment Option and RPO Z15 SS 454 Equipment Option.

(2) The LS3, L34, and L78 could be ordered with one of two manual 4-speed transmissions, the wide ratio M20 or the close ratio M21 or one of several TH400 automatic transmissions, the particular TH400 transmission was dependent on the horsepower rating of the engine.

(3) The LS5 and LS6 engines mandated either the M22 Heavy Duty close-ratio manual 4-speed or one of two TH400 automatic transmissions, the particular TH400 transmission was dependent on the horsepower rating of the engine.

(4) The 307 4-speed transmission is a wide ratio Saginaw cast iron units. This would be the last year this transmission was used. The RPO code, M20, is the same RPO code for the Muncie aluminum case unit.

(5) The 396cid engine was no longer in use and was replaced in late 1969 with a 402cid engine size although with the SS396 Equipment Option both the L34 and L78 were still referred to as 396cid engines. The 402cid L34/L78 engines were exclusive to the SS396 Equipment Option while the 402cid LS3 engine was available in any V8 series or body style EXCEPT when the SS396 Equipment Option was ordered with the Malibu sport coupe, convertible, or the sedan pickup El Camino.

(6) A fourth small-block V8 was introduced in 1970, the 400cid RPO LF6 engine with a 2-bbl carburetor. This engine was used in the full-size passenger car line and the Monte Carlo. This engine was not available as an option in the standard Chevelle lineup even those the Monte Carlo used the same 13xxx series as the Chevelle.

(7) One source, Chevrolet by the numbers, shows CRN for a 1970 Monte Carlo 454/360 with TH400 where a second source, Chevelle, Malibu & El Camino ID numbers 1964-87 (as well as many websites) shows the CRN code for a manual/4-speed Chevelle, and finally Chevelle and El Camino ID Model Codes (NCOA purple book) does not show this engine code at all probably due to the fact it's a Monte Carlo only engine. Every 136xx Chevelle LS5 build sheet I have shows RT for an LS5 w/manual transmission (26 to date) and RQ for an LS5 w/TH400 (another 26). Four Monte Carlo LS5 build sheets shows RN for an LS5 w/TH400. I'll take the information on a build sheet over other published data.

1971 250/307/350/402/454 Engine ID Suffix Codes

1971 Code Size (cid) Horsepower Carburetor RPO Transmission
CAA 250 145 1-bbl L22 Manual 3
CAB 250 145 1-bbl L22 Powerglide/TH350
         
CCA 307 200 2-bbl L14 Manual 3
CCC 307 200 2-bbl L14 Powerglide/TH350
         
CGA * 350 245 2-bbl L65 Manual 4
CGB 350 245 2-bbl L65 Powerglide
CGC * 350 245 2-bbl L65 TH350
CGK 350 270 4-bbl L48 Manual 3-4
CGL 350 270 4-bbl L48 TH350
CJD 350 270 4-bbl L48 TH350
CJG * 350 270 4-bbl L48 Manual
CJJ 350 270 4-bbl L48 Manual 3-4
         
CLA * 402 300 4-bbl LS3 Manual
CLB 402 300 4-bbl LS3 TH400
CLL 402 300 4-bbl LS3 Manual 4
CLP ** 402 300 4-bbl LS3 TH400
CLR 402 300 4-bbl LS3 Manual
CLS 402 300 4-bbl LS3 HD 3-speed (MC1)
           
CPA 454 365 4-bbl LS5 Manual M22
CPD * 454 365 4-bbl LS5 TH400
CPP (1) 454 460 4-bbl LS6 Never offered to the public
CRP (1) 454 460 4-bbl LS6 Never offered to the public
CPY (2) * 454 460 4-bbl LS6 Never offered to the public
CPZ (2) * 454 460 4-bbl LS6 Never offered to the public
(1) This code is found in the ENGINE SERIES NUMBER AND SUFFIX CHART of the Chevrolet Parts and Accessories Catalog dated August 1971 but does not differentiate between the Chevelle and the Monte Carlo; both are considered 13xxx series Chevelles. The CPP code is also found in Chevrolet by the numbers (1970-1975) by Alan Colvin but is listed at 425hp; the CPR code is not listed in this publication however. It should be noted that the ENGINE SERIES NUMBER AND SUFFIX CHART of the Chevrolet Parts and Accessories Catalog dated August 1971 has numerous engine code errors for 1964 to 1971.

(2) This code is found in Chevrolet by the numbers (1970-1975) by Alan Colvin and listed at 425hp and listed for Chevelle as well as Monte Carlo. It's also noted (under Chevelle) that only 10 of the CPY engines and 4 of the CPZ engines were built (although no such information is provided under Monte Carlo). These engine codes are also found on an old Chevelle decoder program and listed at 425hp. Chevrolet by the numbers (1970-1975) by Alan Colvin shows only the CPD coded 454/365hp for the 1971 Monte Carlo.

Engine production totals are listed for U.S. production only.

* Includes Monte Carlo (see note 2 above)
** Monte Carlo exclusive

1972 250/307/350/402/454 Engine ID Suffix Codes

1972 Code Size (cid) Horsepower Carburetor RPO Transmission
CAH 250 110 1-bbl L22 Manual 3 (Low Compression)
CBA 250 110 1-bbl L22 Manual 3
CBD 250 110 1-bbl L22 Manual 3
CBG 250 110 1-bbl L22 Manual 3
CBK 250 110 1-bbl L22 Powerglide
CDL 250 110 1-bbl L22 Powerglide A.I.R.
CDM 250 110 1-bbl L22 Manual 3 A.I.R.
CSD 250 110 1-bbl L22 Powerglide
         
CAY 307 130 2-bbl L14 Manual 3
CAZ 307 130 2-bbl L14 Powerglide
CKG 307 130 2-bbl L14 Manual 3
CKH 307 130 2-bbl L14 Powerglide
CMA 307 130 2-bbl L14 TH350
CTK 307 130 2-bbl L14 TH350
         
CAR 350 165 2-bbl L65 TH350
CDA * 350 165 2-bbl L65 Manual 3-4
CDB ** 350 165 2-bbl L65 Powerglide
CDD * 350 175 4-bbl L48 TH350
CDG 350 175 4-bbl L48 Manual 3-4
CKA * 350 165 2-bbl L65 Manual 3-4
CKB * 350 165 2-bbl L65 TH350
CKD * 350 175 4-bbl L48 TH350
CKK 350 175 4-bbl L48 Manual 3-4
CMD * 350 165 2-bbl L65 TH350
CSH 350 165 2-bbl L65 TH350
CTL * 350 165 2-bbl L65 TH350
         
CLA 402 240 4-bbl LS3 Manual 4 (1)
CLB * 402 240 4-bbl LS3 TH400 (1)
CLS 402 240 4-bbl LS3 Manual 3 (1)
CTA 402 240 4-bbl LS3 Manual 4 - A.I.R.
CTB* 402 240 4-bbl LS3 TH400 - A.I.R.
CTH 402 240 4-bbl LS3 Manual 3 - A.I.R.
CTJ 402 240 4-bbl LS3 TH400 - A.I.R.
           
CPA 454 270 4-bbl LS5 Manual 4
CPD ** 454 270 4-bbl LS5 TH400
CRW* 454 270 4-bbl LS5 TH400 - A.I.R.
CRX 454 270 4-bbl LS5 Manual 4 - A.I.R.

* Includes Monte Carlo
** Monte Carlo exclusive

(1) CLA, CLB, and CLS engine codes are shown in numerous publications but there is an ongoing debate if a 402 engine without A.I.R. was ever installed in a 1972 Chevelle regardless of final assembly plant. If anyone has documented proof such as a build sheet showing either CLA, CLB, or CLS engine codes, and NOT SHOWING RPO K19, please contact me via the Contact page.


GM's own 'Restoration Kit' only shows CLA & CLB but does not mention anything about A.I.R. However, all 1972 Chevelle build sheets I have code the LS3 as either TA or TB.

LS5 engine codes CPA and CPD are noted in some GM documentation but to date no build sheet for a 1972 Chevelle with an LS5 show either of these codes; only CRW and CRX.

NB2 - California required equipment includes A.I.R. and camshaft with longer valve overlap.
A total of 21,779 6-cyl engines were reported installed in Chevelles.
A total of 562,604 8-cyl engines were installed in Chevelles and Monte Carlos; 165,706 307-cid, 373,268 350-cid, and 23,630 402/454-cid engines. However, this does not match the total of 8-cyl cars reportedly built in the U.S. of 578,052. This is a difference of 15,488 8-cyl units with no engines.

Engines reported for the (U.S.-built) Monte Carlo (163,087) does not match the production figure of 163,085 cars. Those break down to 151,859 350-cid, 9,960 402-cid and 1,268 454-cid engines. Seems to be 2 extra engines reported.

Chevrolet reports 584,532 transmissions on the Accumulative Production Report of July 31, 1972. This number is only for U.S.-built Chevelles. This figure does not match the total reported U.S.-built Chevelles of 584,530. This is a difference of 2 transmissions (all types) without cars to put them in. The listed transmissions for the (U.S.-built) Monte Carlo does match the 163,087 engine production but not reported model production number of 163,085.

There is some breakdown of engines or transmissions imported from Canada. Hopefully there will be more as more information becomes available. From Vintage Vehicle Services documentation it is known.

* Of the 21,106 Malibu sport coupes imported into the U.S. 1,542 were equipped with RPO Z15, 266 of those were equipped with RPO LS5, 149 were equipped with the M22 H.D. 4-speed (leaving the remaining 117 equipped with the M40 Turbo Hydramatic 400).
* Of the 21,106 Malibu sport coupes imported into the U.S. 1,542 were equipped with RPO Z15, 520 of those were equipped with RPO LS3, 807 were equipped with the M20, and 226 equipped with ZL2.
* Of 8,083 Malibu sport coupes built in Canada for Canada sales, 152 were equipped with the LS5 engine option. Engine Date/Suffix Code Stamp

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© Chevelle Restoration		 1970 Chevelle SS396/SS454 Build Sheet Decode Program





1964-1972 Ship Manuals & Parts Catalog





1953-1972 Chevrolet Production Numbers