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Buick 300 (4.9) / 340 (5.6) casting numbers

Block Cast # Year Displacement
1357943 64-67
300
1374547 64-67
340
1374557 64-67
300/340 ?
1374871 65-67
300
1375161 65-67
300
1381621 64-67
340
1381622 66-67
300
 
Head Cast # Year Displacement
1366379 64-67
300
1374720 67
300
1374870 64-67
300/340
1376329 66-67
340
1376330 64-67
300/340
1378470 65-67
300
219 64-65
300
330 64-67
300/340
382985 67
340
790 66-67
300
 
Intake Manifold
Cast #
Year Displacement
1358504 64
300 2bbl
1359122 64
300 4bbl
1366695 65
300 4bbl
1367299 65
300 4bbl
1374559 66
340 4bbl
1377507 65-66
300 2bbl
1378707 67
340 2bbl
1379948 66-67
340 4bbl
 
Exhaust Manifold
     Cast #
Year Displacement
1364178 right
1359689 left
64
300
1369310 right
1359689 left
65
300
1375912 right
1375907left
66-67
340
1375910 right
1375917 left
66-67
340
 

A letter or number after the casting number as in 1165165 X or -3 may indicate a change in update in the casting. This would mean a higher letter would be a later production.

A letter or number after the casting number as in 1165165 X or -3 may indicate a change in update in the casting. This would mean a higher letter would be a later production.