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| PONTIAC ENGINE CODES 1959-1979 |
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| YEAR CID H.P. MANUAL TRANNY AUTOMATIC TRANNY |
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| 303 O6B 16K,18K,36P,38P,39N |
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| 303 06B 16K,18K,36P,38P,39N |
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| 421 353 08B,22B 25G,34J,43N,47Q |
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| 389 230 -- 04L,05L,08R,09R |
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| 376 WH,WJ YM[police],YJ,YK |
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| 1967 326 250 WC,WH,WP,WX YJ,YN,YO,XF, XI |
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| 285 WD,WK,WR,XR YM,YP,XG,XO |
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| 325 WI,WU, WQ,WZ YE,YF,YT,XE,XN,XW,XX |
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| 1969 350 265 WC,WM,WP,WU YE,YJ,YN,XB,XL,XR,XS,UY |
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| 400 265 -- YB,YF,YZ,XM,XX |
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| 1971 350 250 WN,WP,WR,WU YN,YP,YU,XR |
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| 400 200 -- YX,YZ,ZR,ZV,ZX |
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| 1973 350 150/175E XR,XV YL,YR,YV,Y2,Y7,ZR,ZV |
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| 150/175L ZB,ZD WA,WC,WD,WF,WL,WN,XZ |
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| 400 170/185E -- Y1,Y4,YP,YX,YZ,ZK,ZX |
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| 200/230E WK,WP,WS Y3,YN,YT,YX,YY,ZN,ZS |
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| 200/230L -- Y6,YF,YG,X5,XK,XN,XX,XZ |
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| 455 215/250E WT,WW AC,YA,YC,YD,YK,ZA |
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| 215/250L ZE,ZZ YE,X7,XA,XE,XJ,XL,XO,XT,XY |
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| 1974 350 155/170 WA,WB AA,YA,YB,YC,YN,YP,YS,ZA,ZB |
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| 170/200 WN,WP YN,YP,YS,ZP |
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| 400 175/190E -- AH,YH,YJ,ZH,ZJ |
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| 175/190L -- AD,YF,YK,ZD,ZK |
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| 200/225L Y3,WR AD,YL,YM,ZS |
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| 455 215/250E -- AU,YR,YU,YW,YX,YY,ZU,ZW,ZX |
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| 215/250L -- A4,Y4,Y6,Y9,Z4,Z6 |
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| 1976 350 160E -- YA,YB,YP,YR |
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| 160L -- X3,XM,XP,XR,XU,XW,XX,ZF,ZH |
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| 170L -- X4,X8,X9,XS,XT,XY,XZ |
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| 185E WT,WU Y6,Y7,YS,YT,YY,YZ,ZA,ZK |
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| 455 200 WX Y3,Y4,Y8,Z3,Z4,Z6 |
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| 1977 350 170 -- Y9,YA,YB,XB,XC |
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| 400 180 -- Y4,Y7,YG,YU,XA,XD,XF,XH,XJ,XK |
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| 1978 400 180 -- YA,YH,YJ,YK,YR,YS,YT,YU,YW,X9,XJ,XK |
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| MULTIPLE H.P.RATINGS IS FOR SINGLE OR DUAL EXHAUST. |
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| "E" STANDS FOR EARLY IN PRODUCTION YEAR, |
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| AND "L" STANDS FOR LATE IN PRODUCTION YEAR. |
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| SINCE PONTIAC REUSED ENGINE CODES OVER AND OVER,IT IS CRITICAL THAT YOU |
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| KNOW EXACTLY WHAT YEAR THE BLOCK IS.ON THE TOP SIDE OF THE BLOCK, |
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| IN THE REAR,BY THE DISTRIBUTOR,THERE IS A DATE CODE. IT WILL BE |
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| A LETTER,FOLLOWED BY 3 NUMBERS.THE LETER SIGNIFIES THE MONTH OF |
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| PRODUCTION[I.E.A=JAN,B=FEB.AND SO-ON],THE NEXT 2 NUMBERS SIGNIFIES THE |
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| DAY OF THE MONTH IT WAS PRODUCED, AND THE LAST NUMBER IS THE YEAR. |
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| I HAVE FOUND THAT GENERALLY ONCE A BLOCK WAS PRODUCED FOR THE 70'S, |
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| THE YEAR IS ALSO CAST IN BIG NUMBERS IN THIS AREA ALSO. A DATE CODE |
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| OF L129 WOULD TRANSLATE TO DECEMBER 12, 1969.THIS WOULD BE A 1970 |
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| BLOCK SINCE IT WAS PRODUCED AFTER SEPTEMBER 1.ANY CODE FROM SEPTEMBER ON |
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| WOULD BE PRODUCED FOR THE FOLLOWING PRODUCTION YEAR. AN AUGUST PRODUCTION |
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| DATE WOULD BE A VERY LATE PRODUCTION ENGINE FOR THAT SAME YEAR. |
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| THE ENGINE CODE ITSELF WILL BE STAMPED[NOT CAST] INTO THE FRONT OF |
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| THE BLOCK,JUST BELOW THE PASSENGER[RIGHT] SIDE HEAD DECK SURFACE.THERE WILL |
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| ALSO BE SOME OTHER NUMBERS STAMPED HERE WITH THE CODE,THESE ARE THOUGHT TO |
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| BE ENGINE PRODUCTION NUMBERS. DON'T WORRY ABOUT THESE NUMBERS,THEY REALLY |
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| DON'T MEAN ANYTHING IMPORTANT. |
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| THE VIN NUMBER WILL ALSO BE STAMPED INTO THE FRONT OF THE BLOCK,DOWN LOW, |
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| NEXT TO THE TIMING COVER,ON THE RIGHT SIDE,ON ALL BLOCKS FROM 1967 AND UP. |
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| THIS IS A SURE FIRE WAY TO SEE IF THE ENGINE IS THE ORIGINAL FOR THAT CAR. |
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| SOMEONE COULD ALWAYS GRIND THE OLD NUMBERS OFF AND STAMP NEW ONES IN[IN AN |
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| ATTEMP TO CLAIM ORIGINALITY],HOWEVER GRINDING MARKS WOULD BE EVIDENT.THE |
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| BODY STYLE NUMBER[OF THE VIN]WILL NOT BE STAMPED IN,ONLY THE YEAR, THE |
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| MANUFACTURING PLANT CODE,AND THE PRODUCTION # OF THE CAR IS STAMPED. |
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| FOR EXAMPLE, ON THE 69 GTO HARDTOP WITH A VIN # OF 242379Z128225,THE |
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| 24237[WHICH SIGNIFIES A GTO HARDTOP]WILL NOT BE STAMPED IN THE BLOCK. |
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| ONLY THE 9Z128225 WILL BE STAMPED. |
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| THIS INFO GATHERED FROM 'PONTIAC HEAVY-DUTY PARTS AND SPECS'by |
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| H.O. RACING SPECIALTIES AND THE 1970 EDITION OF MOTORS AUTO REPAIR |
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