BUICK
INTAKE MANIFOLD
CASTING NUMBERS

YEAR	INTAKE CASTING NUMBER	ENGINE SIZE
1965	1367485 1366695 1363782 1370316	300 300 401 401	2BBL 4BBL 4BBL 2-4BBL
1966	7026145 1375561 1374558 1374559 1375549 1372113	225 300 340 340 401 401/425
1967	1378704 138222 1374062	225 300 400
1968	1382616 1382615 1383448	350 350 400	2BBL 4BBL
1969	1386845 1387069 1386003	350 350 400	2BBL 4BBL
1970	1231381 1231924 1231718	350 350 455	2BBL 4BBL
1971	1236402 1236403	350 455
1972	1238647 1238586 1238578 1239925 12383232	350 350 350 455 455	x Calif. engine 2BBL Calif. Calif. engine
1973	1242014 1242015 1243020	350 350 455	2BBL 4BBL
1974	1245062 1245060 1243815 1245061	350 350 455 455	2BBL 4BBL 2BBL 4BBL
1975	1248470 1249167 1249169 1247331	231 350 350 455	2BBL 2BBL 4BBL
1976	1248470 1249167 1249169 1247331	231 350 350 455	2BBL 2BBL 4BBL

xx
Go to Buick Cylinder Head 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 maont the casting was made.

In the example C 10 this would mean Mach 10th