Big Dog Garage
PONTIAC BLOCK CODES '64-'79
Year CID HORSEPOWER Code
1964 326 280 HP 94x,970
389 230 HP 04L,05L,08R,09R
389 235 HP 22B
389 267 HP 11H,12H
389 283 HP 10A
389 303 HP 25K,26K,27P,28P
389 306 23B,29N
389 325 78X,79J
389 330 32B,34N,33-6
389 348 76X,77J
421 320 35B,38S,43N
421 350 44B,47S,49N
1965 326 250 WP,ZN
326 285 WR,YP
389 256 WA,WB,YA,YB
389 290 WC,YC,YD
389 325 YE,YF
389 333 WE
389 335 WT,YS
389 338 WF,YG
389 360 WS,YR
421 338 HP WG,YH
421 356 WH,YJ
421 376 WJ,YK
1966 326 250 WP,WX,YN,XF
326 285 WR,YP,XG
389 256 WA,WB,YA
389 290 WC,YV,YU,YC,YD
389 325 YX,YL,YW,YF,YE
389 333 WE
389 335 WW,WT,YS,XE
389 360 WV,WS,XS,YR
1967 326 250 HP WP,WX,WC,WH
326 250 HP YO,YN,XF,YJ,XI
326 285 HP WR,XR,WK,WD
326 285 HP YP,XG,YM,XO400255 HPXL,XM
400 260 HP XB
400 265 HP WA,WB
400 265 HP YA,YB,YC,YD
400 290 HP XV,XU
400 293 HP XC
400 325 HP WU,WZ,WQ,WI
400 325 HP YE,YF,YT,XE,XN,XW,XX
400 333 HP WD,WE,WY,XT
400 335 HP WT,WW,YS
400 350 HP XZ,XY,XH,XJ
400 360 HP WS,WV,WR,XS,YZ,XP
428 360 HP WG,Y2,YY
428 376 HP WJ,XK,Y3,YH,Yk
1968 350 265 HP WD,WC,YN,YJ
350 320 HP WR,WK,YP,YM
400 265 HP XM,YA
400 290 HP WA,WB,YC
400 330 HP YT,YW
400 335 HP WQ,WZ,WI,XN
400 340 HP WU,XT
400 350 HP XZ,XH,YS,YZ
400 360 HP WT,WS,XS,XP
400 366 HP WY,XW
428 375 HP WG,YH
428 390 HP WJ,YK
1969 350 265 HP WC,WP,WM,WU
350 265 HP XL,YJ,XR,YN,XB,YE,YU,XS
350 325 HP WK,WN,XC,XD
350 330 HP WR,WV,XT,XU,YP
400 265 HP XM,YZ,XX,YB,YF
400 290 HP WA,WB,WD,WE,YC,YD
400 330 HP WZ,YT
400 335 HP WQ,YW
400 340 HP XZ
400 345 HP WH,XN
400 350 HP WT,WX,YS,XH
400 366 HP WS,YZ
400 370 HP WW,XP
400 375 HP WI,WY,XY,XW
428 360 HP WG,YL,YH,XE,XJ
428 370 HP WF,XF
428 390 HP WJ,WL,YK,XG
1970 350 255 HP W7,WU,X7,YU
400 265 HP XX,YB
400 290 HP WE,YD
400 330 HP XZ,XV
400 350 HP WX,WT,XH,YS
400 366 WS,YZ400370WW,WH,XP,XN
400 370 WW,WH,XP,XN
455 360 HP WA,YC,YH
455 370 HP WG,XF
1971 350 250 HP WR,WU,WN,WP
350 250 HP XR,YU,YN,YP
400 265 HP WS,WX,XX,YX
400 300 HP WK,WT,YS
455 280 HP WG,YG
455 325 HP WJ,YC
455 335 HP WL,WC,YE
1972 350 160 HP WR,YU,YV,YR
400 200 HP YX,YZ,ZR,ZV,ZX
400 250 HP WK,WS,YS,YT,ZS
455 185 YH,YW
455 200 HP ZH
455 220 HP YA,YC,Y
445 525 0YD,YK
455 300 WD,WM,YB,YE
1973 350 150,175 HP XR,WV,ZB,ZD
350 150,175 HP Y2,Y7,YR,YV,ZR,ZV
350 150,175 HP WA,WC,WD,WF,WL,WN,XZ
400 170,185 HP W5,XH,XI,X3,X4
400 170,185 HP YI,YP,YX,YZ,Y4,ZK,ZX
400 200,230 HP WK,WS,WP,YN,YX,YT
400 200,230 HP Y3,ZN,ZS,XK,XN,XX
400 200,230 HP XZ,X5,YF,YG,Y6
455 215,250 HP WT,WW,ZZ,ZE,YA,YC
455 215,250 HP YD,YK,ZA,AC,XA,XE,XJ
455 215,250 HP XL,XY,XT,X7,XO,YE
455 290 ZJ,XD
455 310 Z8,X8
1974 350 155,170 HP WA,WB,AA,YA,ZA
350 155,170 HP YB,YC,ZB,YN,YP,YS
350 170,200 HP WN,WP,ZP,YN,YP,YS
400 175,190 HP AH,YH,YJ,ZH,ZJ
400 175,190 HP AD,YF,YK,ZD,ZK
400 200,225 HP WT,WR,Y3,AT,YT
400 200,225 HP YZ,ZT,AD,YL,YM,ZS
455 215,250 HP AU,YR,YU,YW,YX
455 215,250 HP YY,ZU,ZW,ZX,A4
455 215,250 HP Y4,Y6,Y9,Z4,Z6
455 290 HP W8,Y8
1975 350 155 HP YB,YA
350 175 HP WN,YN,ZP
400 170 HP YH
400 185 HP WT,YS,YT,ZT,YM
455 200 HP WX,YU,YW,ZU,ZW
1976 350 160 HP (Early)YB,YA,YP,YR,ZX
350 160 HP (Late)XM,XP,XU,XR,XW,XX,X3,ZF,ZH
350 165 HP ZX,ZF
400 170 HP (Early)YJ,YC
400 170 HP (Late)X9,X4,XT,XY,XS,XZ,X8
400 185 HP (Early)WT,Y6,Y7,YS,YT,YY,YZ,ZA,ZK
400 185 HP (Late)WY,X7,ZJ,ZL,X6
455 200 HP WX,Y3,Y4,Z3,Z4,Y8,ZB
1977 301 135 HP WB,YW,YX,YH,YK
350 170 HP YA,YB,XB,XC,Y9
400 180 HP XH,XJ,XD,XF
400 180 HP YU,Y4,XA,Y7,XK
400 200 HP WA,Y6
1978 301 140 HP XA,XC,XL,YM
301 140 HP XD,XB,YL,YP
301 150 HP XF,XH,XU,XW
400 180 HP XJ,XK,X9,YK,YH,YS
400 180 HP YT,YJ,YR,YW,YA,YU
400 220 HP WC,X7
1979 301 135 HP PX7,PX9,PXF
301 135 HP PXH,PXP,PXR
301 150 HP PWA,PWB
301 150 HP PX4,PX6,PXL,PXN
301 150 HP PXS,PXT,PXU,PXW
400 220 HP PWH,LAST 400
Pontiac V8 Bore and Stroke Sizes
CUBIC INCHES BORE(inches) Stroke(inches) Main Dia.(inches) Rod Dia.(inches)
265 3.75000 3.0000 3.000 2.250
287 3.75000 3.2500 2.500 2.200
301 4.00000 3.0000 3.000 2.250
303 4.1250 2.8400 3.000 2.250
316/317 3.93750 3.2500 2.500 2.200
326 3.72000 3.7500 3.000 2.250
347 3.93750 3.5625 2.623 2.200
350 3.8750 3.7500 3.000 2.250
366 4.1530 3.3750 3.000 2.250
370 4.06250 3.5625 2.623 2.200
389 4.06250 3.7500 3.000 2.250
400 4.12000 3.7500 3.000 2.250
421 4.09375 4.0000 3.250 2.250
428 4.12000 4.0000 3.250 2.250
455 4.15000 4.2100 3.250 2.250
'59 - '79 PONTIAC V8 HEAD CASTING NUMBERS
Year CID HORSEPOWER Casting# Valve Size CC or CR
1959 389 368-373HP 540306 1.88/1.60 69
1959 421 368-373HP 540306 1.88/1.60 69
1960 389 368-373HP 540306 1.88/1.60 69
1960 421 368-373HP 540306 1.88/1.60 69
1961 389 all 538177 1.88/1.60 69
1961 421 all 538177 1.88/1.60 69
1962 389 all 538177 1.88/1.60 69
1962 421 all 538177 1.88/1.60 69
1961 389SD 368,373HP(61) 540306 1.92/1.66 69
1961 21SD 368,373HP(61) 540306 1.92/1.66 69
1962 389SD 368,373HP(61) 540306 1.92/1.66 69
1962 421SD 368,373HP(61) 540306 1.92/1.66 69
1961 389SD 385,405HP(62) 540306 2.02/1.76 67
544127
1961 421SD 385,405HP(62) 540306 2.02/1.76 67
544127
1962 389SD 385,405HP(62) 540306 2.02/1.76 67
544127
1962 421SD 385,405HP(62) 540306 2.02/1.76 67
544127
1963 326 250HP 543797 1.88/1.60 8.6 c.r.72cc
1963 326 260,280HP 548232 1.88/1.60 10.25 c.r.
1963 389 215,230,235HP 543796 1.88/1.60 8.6 c.r.
1963 389 267,283,303,313HP 543797 1.88/1.60 10.25 c.r.
1963 421 320HP 543797 1.88/1.60 10.75 c.r. 72CC
1963 421 353,370HP 9770716 1.92/1.66 72
1963 421SD 390,405,410HP 544127 2.02/1.76 64
9771980
1964 326 250HP 9773345,(845) 1.88/1.60 8.6 c.r.
1964 326 280HP 9773395 1.88/1.60 10.0 c.r.
1964 389 215,230,235HP 5437796 1.88/1.60 8.6
1964 389 267,283,303,306HP 9773345,(845) 1.92/1.66 10.5 c.r.
1964 421 320HP 9773345,(834) 1.92/1.66 10.75 c.r.
1964 389 325,330,348HP 9770716 1.92/1.66 72
1964 421 350,370HP 9770716 1.92/1.66 72
1965 326 250HP 62 1.88/1.60 8.6 c.r. 70cc
1965 326 285HP 22 1.88/1.60 10.5 c.r. 60cc
1965 389 256HP 75 1.88/1.60 8.6 c.r. 92cc
1965 389 290,325,333HP 76 1.92/1.66 10.5 c.r. 70cc
1965 389 335,338,360HP 77 1.92/1.66 10.5 c.r. 70cc
1965 421 338HP 76 1.92/1.66 10.75 c.r. 68cc
1965 421 356,376HP 77 1.92/1.66 10.75 c.r. 68cc
1966 326 250HP 094 1.88/1.66 8.6 c.r.
1966 326 285HP 095 1.88/1.66 10.5 c.r.
1966 389 256HP 091 1.92/1.66 8.6 c.r.
1966 389 290,325,333HP 092 1.92/1.66 10.5 c.r.
1966 389 335,360HP 093 1.92/1.66 10.5 c.r.
1966 421 338,350HP 092 1.92/1.66 10.75 c.r.
1966 421 356,376HP 093 1.92/1.66 10.75 c.r.
1967 326 250HP 140 1.92/1.64 9.2 c.r.
1967 326 285HP 141 1.92/1.64 10.5 c.r.
1967 400 255,260,265HP 142 1.92/1.64 8.6 c.r.
1967 400 290HP 143,061 1.92/1.64 10.5 c.r.
1967 400 325,333HP Big Car 143,061 1.92/1.64 10.5 c.r.
1967 400 350HP(GP) 670, 2.11/1.77 10.5 c.r.
9787671,187
1967 400 325,335,360HP 670 2.11/1.77 72cc
1967 400 325,360HP RA 670,97 2.11/1.77 72cc
1967 428 360,376HP 670,9787671 2.11/1.77 72cc
1968 350 265HP 17 1.96/1.66 8.6 c.r. 72cc
1968 350 320HP 18 1.96/1.66 10.5 c.r. 64cc
1968 400 265HP 14 1.96/1.66 8.6 c.r. 90cc
1968 400 290,340HP Big Car 15,215 1.96/1.66 10.5 c.r.
1968 400 350HP(GP) 16,216,62 2.11/1.77 72-75cc
1968 400 330HP (FB) 16,216,62 2.11/1.77 72-75cc
1968 400 335,350,360HP 16,62 2.11/1.77 72-75cc
1968 400 335,360HP RA I 31,(37) 2.11/1.77 72cc
1968 400 340(FB),366(GTO) R,96,A(RA II) 2.11/1.77 71cc,rd port
1968 428 375HP 16,216 2.11/1.77 72cc
1968 428 390HP 16,216 2.11/1.77 72cc
1969 350 265HP 47 1.96/1.66 8.6 c.r. 72cc
1969 350 325HP 48 2.11/1.77 10.5 c.r.64cc
1969 400 265HP 45 1.96/1.66 8.6 c.r. 94cc
1969 400 290HP 46 1.96/1.66 10 c.r.68cc
1969 400 340HP(GP) 16,62 2.11/1.77 72cc
1969 400 330,335,350,366HP 16,62,48(MT) 2.11/1.77 72cc
1969 400 345(FB),370(GTO) 722(RAIV) 2.11/1.77 71cc
1969 428 360HP 16 1.96/1.66 10 c.r.
(small valve)46
1969 428 370HP(GP) 62 2.11/1.77 72cc
1969 428 390HP 16,62 2.11/1.77 72cc
1969 400 375HP (RA V) 44 TunnelPort 2.11/1.77 67cc
1969 303 RA V Tunnel Port 546184 2.11/1.77 56cc
1970 350 255HP 11 1.96/1.66 8.8c.r.
1970 400 265HP 11 1.96/1.66 8.6c.r 80cc
1970 400 90HP 16(sm valve) 1.96/1.66 10 c.r. 78cc
1970 400 330HP Big Car 16 1.96/1.66 10 c.r. 78cc
1970 400 330HP 12(m.t.) 2.11/1.77 72cc
1970 400 330HP 13(a.t.) 2.11/1.77 72cc
1970 400 345HP (FB,RAIII) 12 2.11/1.77 72cc
1970 400 350HP(GP) 13 2.11/1.77 72cc
1970 400 350HP(GTO) 12(MT) 2.11/1.77 72cc
1970 400 350HP(GTO) 13(AT) 2.11/1.77 72cc
1970 400 366HP(GTO) 12(RA III) 2.11/1.77 72cc
1970 400 370HP(RA IV) 614 (rd port) 2.11/1.77 71cc
1970 455 360HP Big Car 15 1.96/1.66 87cc
1970 455 360,370HP(GTO,GP) 64 2.11/1.77 87cc
1971 350 250HP 94 1.96/1.66 96cc
1971 400 265HP 99 1.96/1.66 98cc
1971 400 300HP 96 2.11/1.77 96cc
1971 455 280HP 98 1.96/1.66 114cc
1971 455 325HP 66 2.11/1.77 114cc
1971 455 335HP(455HO) 197 2.11/1.77 111cc
(191)rd port
1972 350 175HP 7h1 1.96/1.66 7.6cr 80cc
1972 400 200HP 7j2 1.96/1.66 8.4cc 96cc
1972 400 250HP 7k3 2.11/1.77 96cc
1972 455 200HP 7L4 2.11/1.77 114cc
1972 455 200HP 7L5 2.11/1.77 114cc
1972 455 250HP 7M4 2.11/1.77 114cc
1972 455 250HP 7M5 2.11/1.77 114cc
1972 455 300HP(455HO) 7F6 rd port 2.11/1.77 111cc
1973 350 150,175HP 46,4c 1.96/1.66 96cc
1973 400 170,185HP 46,4c 1.96/1.66 98cc
1973 400 200HP 4x,4c 2.11/1.66 98cc
1973 400 230HP 4x 2.11/1.66 98cc
screw-in stud
1973 455 215,250HP 4x 2.11/1.66 114cc
screw-in stud
1973 455 290HP(455SD) 16,X(rd port) 2.11/1.77 111cc
1974 350 155,170HP 46,4c 1.96/1.66 7.6cr 98cc
1974 350 200HP(GTO) 46 1.96/1.66 7.6cr 89cc
screw-in studs
1974 400 175,190HP 46,4c 1.96/1.66 8.1cr 89cc
1974 400 200HP 4x,4c 1.96/1.66 98cc
1974 400 225HP(AT) 4x 2.11/1.66 98cc
screw-in stud
1974 400 225HP(AT) 4c 2.11/1.66 98cc
1974 400 225HP(MT) 4x 2.11/1.66 98cc
screw-in stud
1974 455 215,250 4x 2.11/1.66 114cc
screw-in stud
1974 455 215,250 4c 2.11/1.66 114cc
1974 455 290HP(455SD) 16,X rd port 2.11/1.77 111cc
1975 350 ALL 5c 2.11/1.66 7.6cr 101cc
1975 400 ALL 5c,6s 2.11/1.66 7.6cr 98cc
1975 455 AIR 6s 2.11/1.66 7.6cr 115cc
1975 350 HO,non-air 5h 2.11/1.66 7.6cr
1976 350 ALL 6X-4,6S 2.11/1.66 7.6cr
1976 400 ALL 6X-8,6S 2.11/1.66 7.6cr
1976 455 AIR 6S 2.11/1.66 7.6cr
1976 455 HO,non-air 6H 2.11/1.66 7.6cr
1977 301 ALL 01 1.72/1.50 8.2cr
1977 350 ALL 6X-4,6S 2.11/1.66 7.6cr
1977 400 180HP 6X-8 2.11/1.66 7.6cr
1977 400 200HP 6X-4 2.11/1.66 8.0cr
1978 301 ALL 1,02 1.72/1.50 8.2cr
1978 350 ALL X-4,6S 2.11/1.66 7.6cr
1978 400 180HP 6X-8 2.11/1.66 7.6cr
1978 400 220HP 6X-4 2.11/1.66 8.1cr
1979 301 ALL 01 1.72/1.50 8.2cr
1979 400 ALL 6X-4 2.11/1.66 8.1cr