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CRANKSHAFTS
Note the following abbreviations will be used:
FS= Forged Steel
CAS= Cast Armasteel
PMI= Pearlitic Malleable Iron
NI= Nodular Iron
PC= Precision Cast
Part Number                           Application                          Material
533038                   1959-60 389 Super Duty                   FS  
541649                    1961-62 389 Super Duty                     FS  
542990                   1961-62 421 Super Duty                      FS
9770488                       1963 421 HO                              CAS
9773383                     1964-65 389 all                           PMI  
9773384                     1964-66 421 HO                           CAS
9782646                     1966 389 all                                 PMI  
9782769                     1966L-69 421/428                        PMI
9795480                     1967-70 400 all                              NI
9794054                     1968-70 RA IV                                 NI
545671                         1969 400 RA V                               FS
546270                        1969 303 RA V                               FS
9799103                       1970-74 455 all                              NI
495030                  1973-74 455 Super Duty                       NI
496414                              1975 400                                   NI
496415                         1975-76 455 all                        NI (PC)
499864                        1976-79 400                            NI (PC)

THIS INFO GATHERED FROM "PONTIAC HEAVY-DUTY PARTS & SPECS" FROM HO RACING SPECIALTIES, INC.