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PONTIAC V8 DECODING (NEW!!)
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'59 - '79 PONTIAC V8 HEAD CASTING NUMBERS

YearCIDHORSEPOWERCasting#Valve SizeCC or CR
1959389368-373HP5403061.88/1.6069
1959421368-373HP5403061.88/1.6069
1960389368-373HP5403061.88/1.6069
1960421368-373HP5403061.88/1.6069
1961389all5381771.88/1.6069
1961421all5381771.88/1.6069
1962389all5381771.88/1.6069
1962421all5381771.88/1.6069
1961389SD368,373HP(61)5403061.92/1.6669
196121SD368,373HP(61)5403061.92/1.6669
1962389SD368,373HP(61)5403061.92/1.6669
1962421SD368,373HP(61)5403061.92/1.6669
1961389SD385,405HP(62)540306,5441272.02/1.7667
1961421SD385,405HP(62)540306,5441272.02/1.7667
1962389SD385,405HP(62)540306,5441272.02/1.7667
1962421SD385,405HP(62)540306,5441272.02/1.7667
1963326250HP5437971.88/1.608.6 c.r.72cc
1963326260,280HP5482321.88/1.6010.25 c.r.
1963389215,230,235HP5437961.88/1.608.6 c.r.
1963389267,283,303,313HP5437971.88/1.6010.25 c.r.
1963421320HP5437971.88/1.6010.75 c.r. 72CC
1963421353,370HP97707161.92/1.6672
1963421SD390,405,410HP544127,97719802.02/1.7664
1964326250HP9773345,(845)1.88/1.608.6 c.r.
1964326280HP97733951.88/1.6010.0 c.r.
1964389215,230,235HP54377961.88/1.608.6
1964389267,283,303,306HP9773345,(845)1.92/1.6610.5 c.r.
1964421320HP9773345,(834)1.92/1.6610.75 c.r.
1964389325,330,348HP97707161.92/1.6672
1964421350,370HP97707161.92/1.6672
1965326250HP621.88/1.608.6 c.r. 70cc
1965326285HP221.88/1.6010.5 c.r. 60cc
1965389256HP751.88/1.608.6 c.r. 92cc
1965389290,325,333HP761.92/1.6610.5 c.r. 70cc
1965389335,338,360HP771.92/1.6610.5 c.r. 70cc
1965421338HP761.92/1.6610.75 c.r. 68cc
1965421356,376HP771.92/1.6610.75 c.r. 68cc
1966326250HP0941.88/1.668.6 c.r.
1966326285HP0951.88/1.6610.5 c.r.
1966389256HP0911.92/1.668.6 c.r.
1966389290,325,333HP0921.92/1.6610.5 c.r.
1966389335,360HP0931.92/1.6610.5 c.r.
1966421338,350HP0921.92/1.6610.75 c.r.
1966421356,376HP0931.92/1.6610.75 c.r.
1967326250HP1401.92/1.649.2 c.r.
1967326285HP1411.92/1.6410.5 c.r.
1967400255,260,265HP1421.92/1.648.6 c.r.
1967400290HP143,0611.92/1.6410.5 c.r.
1967400325,333HP Big Car143,0611.92/1.6410.5 c.r.
1967400350HP(GP)670,9787671,1872.11/1.7710.5 c.r.
1967400325,335,360HP6702.11/1.7772cc
1967400325,360HP RA670,972.11/1.7772cc
1967428360,376HP670,97876712.11/1.7772cc
1968350265HP171.96/1.668.6 c.r. 72cc
1968350320HP181.96/1.6610.5 c.r. 64cc
1968400265HP141.96/1.668.6 c.r. 90cc
1968400290,340HP Big Car15,2151.96/1.6610.5 c.r.
1968400350HP(GP)16,216,622.11/1.7772-75cc
1968400330HP (FB)16,216,622.11/1.7772-75cc
1968400335,350,360HP16,622.11/1.7772-75cc
1968400335,360HP RA I31,(37)2.11/1.7772cc
1968400340(FB),366(GTO)R,96,A(RA II)2.11/1.7771cc,rd port
1968428375HP16,2162.11/1.7772cc
1968428390HP16,2162.11/1.7772cc
1969350265HP471.96/1.668.6 c.r. 72cc
1969350325HP482.11/1.7710.5 c.r.64cc
1969400265HP451.96/1.668.6 c.r. 94cc
1969400290HP461.96/1.6610 c.r.68cc
1969400340HP(GP)16,622.11/1.7772cc
1969400330,335,350,366HP16,62,48(MT)2.11/1.7772cc
1969400345(FB),370(GTO)722(RAIV)2.11/1.7771cc
1969428360HP16(small valve)461.96/1.6610 c.r.
1969428370HP(GP)622.11/1.7772cc
1969428390HP16,622.11/1.7772cc
1969400375HP (RA V)44 Tunnel Port2.11/1.7767cc
1969303RA V Tunnel Port5461842.11/1.7756cc
1970350255HP111.96/1.668.8c.r.
1970400265HP111.96/1.668.6c.r 80cc
1970400290HP16(sm valve)1.96/1.6610 c.r. 78cc
1970400330HP Big Car161.96/1.6610 c.r. 78cc
1970400330HP12(m.t.)2.11/1.7772cc
1970400330HP13(a.t.)2.11/1.7772cc
1970400345HP (FB,RAIII)122.11/1.7772cc
1970400350HP(GP)132.11/1.7772cc
1970400350HP(GTO)12(MT)2.11/1.7772cc
1970400350HP(GTO)13(AT)2.11/1.7772cc
1970400366HP(GTO)12(RA III)2.11/1.7772cc
1970400370HP(RA IV)614 (rd port)2.11/1.7771cc
1970455360HP Big Car151.96/1.6687cc
1970455360,370HP(GTO,GP)642.11/1.7787cc
1971350250HP941.96/1.6696cc
1971400265HP991.96/1.6698cc
1971400300HP962.11/1.7796cc
1971455280HP981.96/1.66114cc
1971455325HP662.11/1.77114cc
1971455335HP(455HO)197(191) rd port2.11/1.77111cc
1972350175HP7h11.96/1.667.6cr 80cc
1972400200HP7j21.96/1.668.4cc 96cc
1972400250HP7k32.11/1.7796cc
1972455200HP7L42.11/1.77114cc
1972455200HP7L52.11/1.77114cc
1972455250HP7M42.11/1.77114cc
1972455250HP7M52.11/1.77114cc
1972455300HP(455HO)7F6 rd port2.11/1.77111cc
1973350150,175HP46,4c1.96/1.6696cc
1973400170,185HP46,4c1.96/1.6698cc
1973400200HP4x,4c2.11/1.6698cc
1973400230HP4x screw-in stud2.11/1.6698cc
1973455215,250HP4x screw-in stud2.11/1.66114cc
1973455290HP(455SD)16,X(rd port)2.11/1.77111cc
1974350155,170HP46,4c1.96/1.667.6cr 98cc
1974350200HP(GTO)46(screw-in studs)1.96/1.667.6cr 89cc
1974400175,190HP46,4c1.96/1.668.1cr 89cc
1974400200HP4x,4c1.96/1.6698cc
1974400225HP(AT)4x(screw-in stud)2.11/1.6698cc
1974400225HP(AT)4c2.11/1.6698cc
1974400225HP(MT)4x(screw-in stud)2.11/1.6698cc
1974455215,2504x(screw-in stud)2.11/1.66114cc
1974455215,2504c2.11/1.66114cc
1974455290HP(455SD)16,X(rd port)2.11/1.77111cc
1975350ALL 5c2.11/1.667.6cr 101cc
1975400ALL 5c,6s2.11/1.667.6cr 98cc
1975455AIR 6s2.11/1.667.6cr 115cc
1975350HO,non-air 5h2.11/1.667.6cr
1976350ALL 6X-4,6S2.11/1.667.6cr
1976400ALL 6X-8,6S2.11/1.667.6cr
1976455AIR6S2.11/1.667.6cr
1976455HO,non-air 6H2.11/1.667.6cr
1977301ALL 011.72/1.508.2cr
1977350ALL 6X-4,6S2.11/1.667.6cr
1977400180HP6X-82.11/1.667.6cr
1977400200HP6X-42.11/1.668.0cr
1978301ALL 1,021.72/1.508.2cr
1978350ALL X-4,6S2.11/1.667.6cr
1978400180HP6X-82.11/1.667.6cr
1978400220HP6X-42.11/1.668.1cr
1979301ALL 011.72/1.508.2cr
1979400ALL 6X-42.11/1.668.1cr

PONTIAC BLOCK CODES '64-'79
YearCIDHORSEPOWERCode
1964326280 HP94x,970
389230 HP04L,05L,08R,09R
389235 HP22B
389267 HP11H,12H
389283 HP10A
389303 HP25K,26K,27P,28P
38930623B,29N
38932578X,79J
38933032B,34N,33-6
38934876X,77J
42132035B,38S,43N
42135044B,47S,49N
1965326250WP,ZN
326285WR,YP
389256WA,WB,YA,YB
389290WC,YC,YD
389325YE,YF
389333WE
389335WT,YS
389338WF,YG
389360WS,YR
421338 HPWG,YH
421356WH,YJ
421376WJ,YK
1966326250WP,WX,YN,XF
326285WR,YP,XG
389256WA,WB,YA
389290WC,YV,YU,YC,YD
389325YX,YL,YW,YF,YE
389333WE
389335WW,WT,YS,XE
389360WV,WS,XS,YR
1967326250 HPWP,WX,WC,WH
326250 HPYO,YN,XF,YJ,XI
326285 HPWR,XR,WK,WD
326285 HPYP,XG,YM,XO
400255 HPXL,XM
400260 HPXB
400265 HPWA,WB
400265 HPYA,YB,YC,YD
400290 HPXV,XU
400293 HPXC
400325 HPWU,WZ,WQ,WI
400325 HPYE,YF,YT,XE,XN,XW,XX
400333 HPWD,WE,WY,XT
400335 HPWT,WW,YS
400350 HPXZ,XY,XH,XJ
400360 HPWS,WV,WR,XS,YZ,XP
428360 HPWG,Y2,YY
428376 HPWJ,XK,Y3,YH,Yk
1968350265 HPWD,WC,YN,YJ
350320 HPWR,WK,YP,YM
400265 HPXM,YA
400290 HPWA,WB,YC
400330 HPYT,YW
400335 HPWQ,WZ,WI,XN
400340 HPWU,XT
400350 HPXZ,XH,YS,YZ
400360 HPWT,WS,XS,XP
400366 HPWY,XW
428375 HPWG,YH
428390 HPWJ,YK
1969350265 HPWC,WP,WM,WU
350265 HPXL,YJ,XR,YN,XB,YE,YU,XS
350325 HPWK,WN,XC,XD
350330 HPWR,WV,XT,XU,YP
400265 HPXM,YZ,XX,YB,YF
400290 HPWA,WB,WD,WE,YC,YD
400330 HPWZ,YT
400335 HPWQ,YW
400340 HPXZ
400345 HPWH,XN
400350 HPWT,WX,YS,XH
400366 HPWS,YZ
400370 HPWW,XP
400375 HPWI,WY,XY,XW
428360 HPWG,YL,YH,XE,XJ
428370 HPWF,XF
428390 HPWJ,WL,YK,XG
1970350255 HPW7,WU,X7,YU
400265 HPXX,YB
400290 HPWE,YD
400330 HPXZ,XV
400350 HPWX,WT,XH,YS
400366WS,YZ
400370WW,WH,XP,XN
455360 HPWA,YC,YH
455370 HPWG,XF
1971350250 HPWR,WU,WN,WP
350250 HPXR,YU,YN,YP
400265 HPWS,WX,XX,YX
400300 HPWK,WT,YS
455280 HPWG,YG
455325 HPWJ,YC
455335 HPWL,WC,YE
1972350160 HPWR,YU,YV,YR
400200 HPYX,YZ,ZR,ZV,ZX
400250 HPWK,WS,YS,YT,ZS
455185YH,YW
455200 HPZH
455220 HPYA,YC,Y4
455250YD,YK
455300WD,WM,YB,YE
1973350150,175 HPXR,WV,ZB,ZD
350150,175 HPY2,Y7,YR,YV,ZR,ZV
350150,175 HPWA,WC,WD,WF,WL,WN,XZ
400170,185 HPW5,XH,XI,X3,X4
400170,185 HPYI,YP,YX,YZ,Y4,ZK,ZX
400200,230 HPWK,WS,WP,YN,YX,YT
400200,230 HPY3,ZN,ZS,XK,XN,XX
400200,230 HPXZ,X5,YF,YG,Y6
455215,250 HPWT,WW,ZZ,ZE,YA,YC
455215,250 HPYD,YK,ZA,AC,XA,XE,XJ
455215,250 HPXL,XY,XT,X7,XO,YE
455290ZJ,XD
455310Z8,X8
1974350155,170 HPWA,WB,AA,YA,ZA
350155,170 HPYB,YC,ZB,YN,YP,YS
350170,200 HPWN,WP,ZP,YN,YP,YS
400175,190 HPAH,YH,YJ,ZH,ZJ
400175,190 HPAD,YF,YK,ZD,ZK
400200,225 HPWT,WR,Y3,AT,YT
400200,225 HPYZ,ZT,AD,YL,YM,ZS
455215,250 HPAU,YR,YU,YW,YX
455215,250 HPYY,ZU,ZW,ZX,A4
455215,250 HPY4,Y6,Y9,Z4,Z6
455290 HPW8,Y8
1975350155 HPYB,YA
350175 HPWN,YN,ZP
400170 HPYH
400185 HPWT,YS,YT,ZT,YM
455200 HPWX,YU,YW,ZU,ZW
1976350160 HP(Early)YB,YA,YP,YR,ZX
350160 HP(Late)XM,XP,XU,XR,XW,XX,X3,ZF,ZH
350165 HPZX,ZF
400170 HP(Early)YJ,YC
400170 HP(Late)X9,X4,XT,XY,XS,XZ,X8
400185 HP(Early)WT,Y6,Y7,YS,YT,YY,YZ,ZA,ZK
400185 HP(Late)WY,X7,ZJ,ZL,X6
455200 HPWX,Y3,Y4,Z3,Z4,Y8,ZB
1977301135 HPWB,YW,YX,YH,YK
350170 HPYA,YB,XB,XC,Y9
400180 HPXH,XJ,XD,XF
400180 HPYU,Y4,XA,Y7,XK
400200 HPWA,Y6
1978301140 HPXA,XC,XL,YM
301140 HPXD,XB,YL,YP
301150 HPXF,XH,XU,XW
400180 HPXJ,XK,X9,YK,YH,YS
400180 HPYT,YJ,YR,YW,YA,YU
400220 HPWC,X7
1979301135 HPPX7,PX9,PXF
301135 HPPXH,PXP,PXR
301150 HPPWA,PWB
301150 HPPX4,PX6,PXL,PXN
301150 HPPXS,PXT,PXU,PXW
400220 HPPWH,LAST 400



Pontiac V8 Bore and Stroke Sizes


CUBIC INCHESBORE(inches)Stroke(inches)Main Dia.(inches)Rod Dia.(inches)
2653.750003.00003.0002.250
2873.750003.25002.5002.200
3014.000003.00003.0002.250
3034.1250 2.84003.0002.250
316/3173.937503.25002.5002.200
3263.720003.75003.0002.250
3473.937503.56252.6232.200
3503.8750 3.75003.0002.250
3664.1530 3.37503.0002.250
3704.062503.56252.6232.200
3894.062503.75003.0002.250
4004.120003.75003.0002.250
4214.093754.00003.2502.250
4284.120004.00003.2502.250
4554.150004.21003.2502.250