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.

headcode6x03

 

 

 

 

 

 

 

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