Pontiac V8 Casting Numbers

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,XO
	400	255 HP	XL,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,YZ
	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,Y4
	455	250	YD,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

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)	540306,544127	2.02/1.76	67
1961	421SD	385,405HP(62)	540306,544127	2.02/1.76	67
1962	389SD	385,405HP(62)	540306,544127	2.02/1.76	67
1962	421SD	385,405HP(62)	540306,544127	2.02/1.76	67
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	544127,9771980	2.02/1.76	64
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)	670,9787671,187	2.11/1.77	10.5 c.r.
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(small valve)46	1.96/1.66	10 c.r.
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 Tunnel Port	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	290HP	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(191) rd port	2.11/1.77	111cc
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 screw-in stud	2.11/1.66	98cc
1973	455	215,250HP	4x screw-in stud	2.11/1.66	114cc
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(screw-in studs)	1.96/1.66	7.6cr 89cc
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(screw-in stud)	2.11/1.66	98cc
1974	400	225HP(AT)	4c	2.11/1.66	98cc
1974	400	225HP(MT)	4x(screw-in stud)	2.11/1.66	98cc
1974	455	215,250	4x(screw-in stud)	2.11/1.66	114cc
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

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