Hitman's Pontiac Trans Am Page     |   1978 Pontiac Trans Am

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Engine Codes

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     Now I also have quite a few poeple ask me for clarification on Engine Numbers for their specific year.  I have put down the main engine codes here, but there are more, I just put down the most popular.  I have most of the years here from 1967 to 1981.  I have listed the Pontiac 400's, Olds 403, etc. for the Pontiac Trans Ams, Firebirds, and Formulas.

On the Pontiac 400, you can look on the passeneger side of the engine block, just below the heads for the engine code.  And on the same side, real low on the block would be the VIN number

  

1967

Pontiac 400:  WI, WQ, WU, WZ (manual), YT, XN (automatic)

1968

Pontiac 400:  WZ (manual), YT (automatic)

Pontiac 400 HO:  WQ (Manual), YW (automatic)

Pontiac 400 Ram Air:  XN, XT (automatic), WU, WI (manual)

1969

Pontiac 400:  WZ (manual), YT (automatic)

Pontiac 400 Ram Air III:  WQ (manual), YW (automatic)

Pontiac 400 Ram Air IV:  WH (manual), XN (automatic)

1970

Pontiac 400:  WK, WS, WT (manual), XX, YS, YX (automatic)

Pontiac 455:  WC, WJ, WL (HO) (manual), YC, YE (HO) (automatic)

1971

Pontiac 400:  WK, WS, WT (manual), XX, YS, YX (automatic)

Pontiac 455:  WC, WJ, WL (manual), YC, YE (automatic)

1972

Pontiac 400:  WK (manual), YS, YX, ZS, ZX (automatic)

Pontiac 455:  WD, WM (manual), YB, YE (automatic)

1973

Pontiac 400:  WK, WP, WS, Y6, YG (manual), Y3, XN, YS, YX, YZ, ZK, ZX (automatic)

Pontiac 455:  WT, WW (manual), YA, YC, YD, YK (automatic)

Pontiac 455 SD:  W8 (manual), Y8 (automatic)

1974

Pontiac 400:  WT, Y3 (manual), AD, AH, AT, YT, YZ, YF, YH, ZJ, ZK, YL, YM, A3, YT, AT, ZS, ZT (automatic)

Pontiac 455:  AU, YW, YY (automatic)

Pontiac 455 SD:  W8 (manual), Y8 (automatic)

1975

Pontiac 400:  WT (manual), YS (automatic)

Pontiac 455:  WZ (manual)

1976

Pontiac 400:  Y9, YS, YZ, ZK, Y9 (automatic)  WU, WT (manual)

Pontiac 455:  WX

1977

L78 Pontiac 400:  XA

W72 Pontiac 400:  Y6, YG (automatic)  WA (manual)

Olds 403:  VA, VB, U2, U3

1978

L78 Pontiac 400:  YA, YU

W72 Pontiac 400:  X7, WC

Olds 403:  VA, VB, U2, U3

1979

W72 Pontiac 400:  PWH (manual only)

Olds 403:  Q6, QE, QJ, QK, QL

Pontiac 301:  X4, X6

1980

Pontiac 301:  XC, XM, XN, YN

Pontiac 301 Turbo: YL

Chevy 305:  CEL, CEM

1981

Pontiac 301:  BD, BJ

Pontiac 301 Turbo: BO, CJ

Chevy 305:  D6A, D6B, D6D, DHA, DHB, DHC, DHD, DHF, DHH, DHJ, DHK, DHU, DHZDJ, DKB, DND

     I had alot of help from various web sources and from the Catalog of Firebird ID Numbers 1967-93.  Also, the Parts and Illustration Catalog from Pontiac.

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