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ENGINE CODES

 
PONTIAC
1974                       Code Prefix
6-250 9 CCR
6-250 9 CCX
6-250 9 CCW
V8-350 1, 16 AA
V8-350 1 WB
V8-350 1 WA
V8-350 1 YB
V8-350 1 YA
V8-350 1 YC
V8-350 2, 16 YS
V8-350 1 ZB
V8-350 1 ZA
V8-350 2 WP
V8-350 2 WN
V8-350 2 YP
V8-350 2 YN
V8-350 2 ZP
V8-400 1, 16 AD
V8-400 1, 16 AH
V8-400 2, 16 AT
V8-400 2, 16 A3
V8-400 1 YH
V8-400 1 YJ
V8-400 1 ZH
V8-400 2, 16 WR
V8-400 2 WT
V8-400 1, 16 YF
V8-400 1, 16 YK
V8-400 2, 16 YL
V8-400 2, 16 YM
V8-400 2, 16 YZ
V8-400 2, 16 Y3
V8-400 2 YT
V8-400 1, 16 ZD
V8-400 1, 16 ZJ
V8-400 1, 16 ZK
V8-400 2, 16 ZS
V8-400 2 ZT
V8-455 2, 16 AW
V8-455 2, 16 A4
V8-455 2, 16 YR
V8-455 2, 16 YW
V8-455 2, 16 YX
V8-455 2, 16 YY
V8-455 2, 16 Y4
V8-455 2, 16 Y6
V8-455 2, 16 Y9
V8-455 2 YU
V8-455 2 ZU
V8-455 2, 16 ZW
V8-455 2, 16 ZX
V8-455 2, 16 Z4
V8-455 2, 16 Z6
V8-455 8 W8
V8-455 8 Y8
 
1975                       Code Prefix
6-250 9, 17 JT
6-250 9, 17 JL
V8-260 1, 18 QA
V8-260 1, 18 QD
V8-260 1, 18 QE
V8-260 1, 18 QJ
V8-260 1, 18 TE
V8-260 1, 18 TJ
V8-350 19 RS
V8-350 19 RI
V8-350 1 YA
V8-350 1 YB
V8-350 19 RW
V8-350 19 RX
V8-350 19 RN
V8-350 19 RO
V8-350 2 WN
V8-350 2 YN
V8-350 2 ZP
V8-400 1 YH
V8-400 2 YT
V8-400 2 ZT
V8-400 2 YM
V8-400 2 WT
V8-400 2 YS
V8-455 2 YW
V8-455 2 YU
V8-455 2 ZU
V8-455 2 ZW
V8-455 2 WX
   
Configuration:

1- 2 Bar. Carb           2- 4 Bar. Carb            3- Three 2 Bar. carbs

7- Air condition        8- Super duty            9- 1 Bar. Carb 
                                    engine 

10- Taxi                    11- Police , taxi         12- Police                    

13-  A/C Police,        15-  Two 4 bar.          16- High energy ignition
      taxi                                 carbs                H.E.I

17- See Chevy for service procedures

18- See Olds for service procedures

19- See Buick for service procedures
       1962-63      1964-65      1966-67      1968-69      1970-71      1972-73
The engine codes decoder reveals the code prefix, engine performance, displacement, and configuration.