Pontiac crank numbers
Year                              Engine              Mtl.              Crank#                     Notes
1939-1954                  all 6cyl                                   506176      
1946-1949                  all 8cyl                                   508454      
1950-1954                  all 8cyl                                   512512      
1955                                 287                FS              518047   
1956                                 317                FS              521602   
1957                                 347                FS              530048   
1958                                 370                FS              528527   
1959-1962                     389                   AS              531369             except Super Duty
1959-1960                     389                   SD,FS        533038             Limited production
1961-1962                     389                   SD,FS        541649             Limited production
1961-1963                     421                   SD,FS        542990             Limited production (approx 2000)
1961-1962                     215                                     542239             Tempest
1961-1963                     4cyl                                     1193645           Tempest
1962-1963                     421                    AS             9770488           And HO engines
1963                              326                    AS             545585             Special Tempest transaxle hub
1963                              389                    AS             544191             "Pontiac V8 except 421"
1964-1965                     6 cyl                                    3864465           Tempest; supplied without pilot bearing
1964-1965                     V8                      AS             9773382           Tempest including 389 Armasteel "400"
1964-1965                     389                    AS             9773383      
1964-1965                     421                                      977384             And HO; might require different connecting rod
                                                                                                           for balance

1966                               421                    AS             9773384           1st Type: if using 1965 type piston different connecting
                                                                                                            rods are required

1966-1967                      326                    AS             9782770   
 1966                              389                      N              9783786   
late 1966                        421                     AS             9783787   
1966-1967                     6 cyl                                      9782279           Firebird and Tempest; use pilot bearing
                                                                                                            (P/N3752487) for MT

1966-1968                   421-428                 AS             9783787           2nd type: AS long snout
1967-1970                      400                     AS             97954               except Ram Airlate 
1967-early 1968             400                       N              9773524    
1968-1979                      400                       N              4813                 both "N" crank and standard w/ 2 3/4" flangeearly
1968                               350                       N              9793573            late
1968-1970                      350                       N              9795479     
1968                              400 RA                  AS             9794054           WU, WY, XT, XW engines
1968-1969                      6 cyl                                       9790154           Firebird and Tempest; use pilot bearing
                                                                                                              (P/N3752487) for MT

late  1968-1969              428                       N             9782769      
1969                               303                       FS           546270                Limited production
1969-1974                      400                       N             97954                  2 3/4" flange
1969                               400 RAIV               N             9795481              WH, WW, XN, XP engines, 0.001 more clearance.
1970                               400 RAIV               N             9795481   
1969                               400 RAV               FS            545671                Limited production
1970                               366                       FS                                        Moldex forging, Limited production
1970-1979                      350/400                                 9773524             non "N" with 2 3/4" flange
1970-1976                      455                                        496453   
1970-1976                      455                        N              9799103             Approx wt 72 lbs came both "N" and standard
1971-1974                      350                        N              4813  
 1971-1974                      400                       N              4813   
1972                              SD-455                  FS                                        Kellog forging, Limited production
1973-1974                     SD-455                   N              490164               W8, Y8, X8, Z8, ZJ, XD engines
1973-1976                      455                        N              496453                Service replacement
1975-early 1976              350                        N              496452               Thin counterweights
1975-early 1976              400                        N              496414               Thin counterweights
1975-1976                      455                         N              496415               Thin counterweights
1975-1976                      455                         N              496453               Thin counterweightslate
1976-1979                      350                         N              496452                Thin counterweightslate
1976-1979                      400                         N              499864               Thin counterweights
1977-1981                      301                         N              525887               End counterweights only
1980-1981                      265                         N              525887               End counterweights only