Pontiac heads have their casting codes cast on to the center exhaust ports. Together with the date code, you can determine the valve size and cc the chamber.

Casting #	Year	CID	HP	Valve	CC	Notes
518024	1955	287	173, 180, 200	1.78/1.50
522010	1956	316	192, 205, 216, 227, 285	1.78/1.50
523298	1957	347	227, 244, 252, 270, 290	1.78/1.50
524852	1957	347	317	1.78/1.50		Fuel Injection
528511	1958	347	310, 315, 330, 338	1.78/1.50
528511	1958	370	240, 255, 270, 285, 300	1.78/1.50
531395	1959	389	315, 330, 345	1.78/1.50
531395	1959	389	215, 245, 260, 280, 300	1.88/1.60
535461	1960	389	348, 363	1.92/1.60	68	Super Duty
536109	1960	389	303, 318, 333, 389, 348	1.88/1.60
536109	1960	389	215, 230, 235, 281, 283	1.88/1.60
538177	1961-62	389		1.88/1.60
538177	1961-62	421		1.88/1.60
540306	1961-62	389	368, 385	1.92/1.66	68	Super Duty
540306	1961-62	421	373, 405	1.92/1.66	68	Super Duty
544127	1961-62	421	373, 405	2.02/1.76	68	Super Duty
9771980	1962-63	421	390, 405, 410	2.02/1.76	68	Super Duty
543797	1963	326	250	1.88/1.60
543797	1963	389	267, 283, 303, 313	1.88/1.60
543797	1963	421	320	1.88/1.60
544127	1963	421	390, 405, 410	2.02/1.76	68	Super Duty
548332	1963	326	260, 280	1.92/1.66	68
9770716	1963	421	353, 370	1.92/1.66	68	HO
9772652	1963	326	260, 280	1.92/1.66	68
543796	1963-64	389	215, 230, 235	1.88/1.60
9770716	1964	389	325, 330, 348	1.92/1.66	68	GTO
9770716	1964	421	350, 370	1.92/1.66	68
9773345	1964	326	250	1.92/1.66	68
9773345	1964	389	267,283,303,306	1.92/1.66	68
9773345	1964	421	320	1.92/1.66	68
9773395	1964	326	280	1.92/1.66	68
22	1965	326	285	1.92/1.66	68
62	1965	326	250	1.92/1.66	68
75	1965	389	256	1.92/1.66	68
76	1965	389	290, 326, 333	1.92/1.66	68	GTO
76	1965	421	338	1.92/1.66	68
77	1965	389	335,338,360	1.92/1.66	68
77	1965	421	256, 376	1.92/1.66	68	HO
91	1966	389	256	1.92/1.66	68
92	1966	389	290, 325, 333	1.92/1.66	70	GTO
92	1966	421	338,350	1.92/1.66	70
93	1966	389	335,338,360	1.92/1.66	68
93	1966	421	256, 376	1.92/1.66	68	HO
94	1966	326	250	1.92/1.66	68
95	1966	326	285	1.92/1.66	68
97	1967	400	325,360	2.11/1.77	72	late Ram Air
61	1967	400	290 325, 333	2.11/1.77	72
140	1967	326	250	2.11/1.77	72
141	1967	326	285	2.11/1.77	72
142	1967	400	255, 260, 265	2.11/1.77	72
143	1967	400	290, 325, 333	2.11/1.77	72
187	1967	400	350	2.11/1.77	72
670	1967	400	325, 335, 360	2.11/1.77	72	RA
670	1967	428	360, 376	2.11/1.77	72
997	1967	400	325, 360	2.11/1.77	72	RA
671	1967	400	350	2:11/1.77	72
671	1967	428	360, 376	2.11/1.77	72	Early Grand Prix 428 H.O.
14	1968	400	265	2.11/1.77	72
15	1968	400	290, 340	2.11/1.77	72
16	1968	400	330, 335, 350, 360	2.11/1.77	72	HO
16	1968	428	375, 390	2.11/1.77	72
17	1968	350	265	2.11/1.77
18	1968	350	320	2.11/1.77
31	1968	400	335, 360	2.11/1.77	72	Ram Air
37	1968	400	335, 360	2.11/1.77	72	Ram Air
62	1968	400	330,335,350,360	2.11/1.77	72	AT
62	1968	428	375, 390	2.11/1.77	72
96	1968	400	340, 366	2.11/1.77	71	Ram Air II
214	1968	400	265	2.11/1.77	72
215	1968	400	290, 340	2.11/1.77	72
216	1968	400	330, 335.350,360	2.11/1.77	72
216	1968	428	375, 390	2.11/1.77	72
16	1969	400	330, 335, 340, 350, 366	2.11/1.77	72	Ram Air III
16	1969	428	360, 390	2.11/1.77	72
44	1969	400	375	2.19/1.66		Ram Air V
45	1969	400	265	2.11/1.77
46	1969	400	290	2.11/1.77
47	1969	350	265	2.11/1.77
48	1969	350	325	2.11/1.77	72
48	1969	400	330, 335, 350, 366	2.11/1.77	72	MT Ram Air III
62	1969	400	330, 335, 340, 350, 366	2.11/1.77	72	Ram Air III
62	1969	428	370, 390	2.11/1.77	72
722	1969	400	345, 370	2,11/1.77	71	Ram Air IV
184	1969	303		2.19/1.62		Ram Air V
722	1969	400	345, 370	2.11/1.77	71	Ram Air IV
11	1970	350	255	2.11/1.77
11	1970	400	265	2.11/1.77
12	1970	400	330, 350	2.11/1.77	72	MT Ram Air III
12	1970	400	345, 366	2.11/1.77	72	Ram Air III
13	1970	400	330, 350	2.11/1.77	72	AT Ram Air III
15	1970	455	360	2.11/1.77	72
16	1970	400	290, 330	2.11/1.77		Press-in studs
47	1970	350	255	2.11/1.77
47	1970	400	265	2.11/1.77
64	1970	455	360, 370	2.11/1.77	87	HO
614	1970	400	370	2,11/1,77	71	Ram Air IV
66	1971	455	325	2.11/1.77	114	AT
94	1971	350	250	2.11/1.77	96
96	1971	400	300	2.11/1.77	96	GTO
98	1971	455	280	2.11/1.77	111
99	1971	400	265	2.11/1.77	96
191	1971	455	335	2.11/1.77	111	HO
197	1971	455	335	2.11/1.77	111	HO
7F6	1972	455	300	2.11/1.77	111	HO
7H1	1972	350	175	2.11/1.77	96
7J2	1972	400	200	2.11/1.77	96
7K3	1972	400	250	2.11/1.77	96
7L4	1972	455	200	2.11/1.77	96
7M5	1972	455	250	2.11/1.77	111
16	1973	455	290	2.11/1.77	111	Super Duty, screw in studs
46	1973	350	150, 175	2.11/1.66	98
46	1973	400	170, 185	2.11/1.66	98
4C	1973	350	150, 175	2.11/1.66	98
4C	1973	400	170, 185, 200	2.11/1.66	98
4X	1973	400	200	2.11/1.66	98
4X	1973	400	230	2.11/1.66	98	screw in studs
4X	1973	455	215,250	2.11/1.66	114	screw in studs
16	1973	455	290	2.11/1.77	111	Super Duty , screw in studs
16	1974	455	290	2.11/1.77	111	Super Duty, screw in studs
46	1974	350	155, 170	2.11/1.66	98
46	1974	350	200	2.11/1.66	89	GTO screw in studs
46	1974	400	175, 190	2.11/1.66	98
4C	1974	350	155, 170	2.11/1.66	98
4C	1974	400	175, 190	2.11/1.66	98
4C	1974	400	200	2.11/1.66	98
4C	1974	400	225	2.11/1.66	98	AT, screw in studs
4X	1974	400	200	2.11/1.66	98
4X	1974	400	225	2.11/1.66	98	screw in studs
4X	1974	455	215, 250	2.11/1.66	114	screw in studs
51	1975	455	200	2.11/1.66	101
5C	1975	350	155, 175	2.11/1.66	101
5C	1975	400	185	2.11/1.66	101
6H	1975	455	200	2.11/1.66	124	HO
6S	1975	455	200	2.11/1.66	124	HO
6H	1976	455	200	2.11/1.66	124
6S	1976	350	160, 165	2.11/1.66	124
6S	1976	400	185	2.11/1.66	124
6X	1976	350	160, 165	2.11/1.66	101
6X	1976	400	185	2.11/1.66	101
01	1977	301	135	1.72/1.50
6S	1977	350	170	2.11/1.66	124
6X	1977	350	170	2.11/1.66	101
6X	1977	400	180, 200	2.11/1.66	101
01	1978	301	135	1.72/1.50
6X	1978	350	170	2.11/1.66	101
6X	1978	400	180, 220	2.11/1.66	101
01	1979	301	135	1.72/1.50
02	1979	301	150	1.72/1.50
6X	1979	400	220	2.11/1.66	101

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Most recent revision Thursday, January 6th, 2005