BUICK
CYLINDER HEAD
CASTING NUMBERS

YEAR	CASTING NUMBER	ENGINE SIZE
1965	1368767 1366379 1374870 1196914	225 300 300 401
1966	1376348 1376330 1377867	225 300/340 401/425
1967	13763116 1377979 1377980 1372963 1382983 1382985 1382986	225 400 400 430 430 430 430	x x Big port head Big port head Big port head Big port head
1968	1382546 1384720 1382091 1382983 1382985 1384720 1382091	350 400 400 430 430 430 430	x Big port head Big port head Big port head Big port head
1969	1382546 1231109	350 400/430
1970	1233472 1240142 1240143 1231786 1240149 1240150	350 350 350 455 455 455	x Service Replacement Service Replacement Service Replacement Service Replacement
1971	1237650 1240142 1240143 1237661 1240145 1240149	350 350 350 455 455 455	x Service Replacement Service Replacement Service Replacement Service Replacement
1972	1242145 1242556 1242458 1242457 1238148 1242445 1241449 1242455	350 350 350 350 455 455 455 455	x x Service Replacement Service Replacement Service Replacement Service Replacement
1973	1241861 1241860	350 455
1974	1241861 1241860	350 455
1975	1249175 1243452 1246322	231 350 455	Large chamber
1976	1249175 1243452 1246322	231 350 455	Large chamber

Go to Buick Intake Manifold casting list

Casting Date Codes
Typically a letter followed by a number, C 10

The letter represents the month the casting was made.
A January
B February
C March
D April
E May
F June
G July
H August
J September
K October
L November
M December
Note: The letter 'I' is not used

The number is the day of month the casting was made.

In the example C 10 this would mean March 10th