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Here's a few code for the Turbo 400s!
YEAR APPLICATION CODE
1964 300 V8 LeSabre BU
  401 V8 column shift BJ
  401 V8 console shift BK
  425 V8 column shift BL
  425 V8 one carb console shift BN
  425 V8 two carb column shift BP
  425 V8 two carb console shift BQ
1965 300 V8 LeSabre BU
  401 V8 3.07 axle BJ
  401 V8 Riviera (3.23 axle) BR
  425 V8 4bbl. carb 3.07 axle BN
  425 V8 3.23 axle BT
  425 V8 two carb 3.07 axle BO
  425 V8 two carb Riviera (3.42 axle) BS
1966 340 V8 LeSabre BU
  401 V8 BR
  425 V8 Grand Sport & Riviera BS
  425 V8 all others BT
1967 340 V8 LeSabre 400 BU
  400 V8 GS400 BA
  430 V8 Wildcat, Electra & Riviera BT
  430 V8 Sport Wagon 400 BW
1968 350 V8 LeSabre BU
  400 V8 Sportwagon BW
  400 V8 GS 400 BA
  430 V8 Wildcat, Electra & Riviera BT
1969 350 V8 LeSabre BU
  400 V8 Sportwagon AW
  400 V8 GS 400 BA, BB
  430 Wildcat & Electra BC
  430 Riviera BT
1970 455 GS BA
  455 GS Stage 1 BB
  455 Riviera BT
  455 all others BC
1971 455 GS BS
  455 GS Stage 1 BB, OW
  455 Riviera BT
  455 all others BC
1972 455 GS BS
  455 GS Stage 1 BB
  455 Centurion high performance BU
  455 Riviera GS other models with performance rears BT
  455 all others BK,BC
1973 455 Century & Regal BS
  455 Century & Regal Stage 1 Ram Air BB
  All high performance BT
  All others BC
1974 455 Century & Regal BS
  455 Century & Regal Stage 1 Ram Air BB
  All high performance BT
  All others BC
1975 350 Lesabre (Turbo 375) BK
  400 OC
  455 BC,BT
1976 350 Lesabre (Turbo 375) BK
  455 BC
  455 BT
1977 350 Century wagon BC,BB
  350 OB
  403 OC
1978 350 Electra & Riviera OD
  350 Electra & Riviera OB
  400 BC
  403 OD
1979 350 Electra (Buick engine) BB
  350 Electra (Olds engine) OB
  403 Electra OC,OD
1980 350 Electra (Buick engine) BB
  350 Electra (Olds engine) OB
1981 350 Electra (Buick engine) BB
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