Buick Small Block Casting Numbers

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300/340
350

Buick 350 (5.7) Casting Numbers

Head Cast #	Year	Displacement
1232650	71?	350
1233472*	67-72	350
1237650*	70-72	350
1238145*	67-72	350
1233472	67-68	350
1237650*	70-72	350
1237749	70-76	350
1238145x	68-74	350
1240143	70-71	350
1241861**	72-80	350
1242145*	72	350
1242556*	70-80	350
1243452**	72-80	350
1247716	70-77	350
1382546	68-69	350
1382546*	68-74	350
1382720	68-70	350
22505236	73-80	350
22505238**	72-80	350
243452**	75-79	350
* Oils through push rods ** With A.I.R. 350 heads are 58cc

Exhaust Manifold Cast #	Year	Displacement
1246656 right 1246713 left	75	350
1246658 right 1243457 left	71-74	350
1246658 right 1383427 left	68-70	350
1381750 right 1231359 left	70	350

Block Cast #	Year	Displacement
1241748	62-80	350
1231447	71?	350
1233472	67-68	350
1237650	70-72	350
481990	70-72	350
25504744	72-80	350

Intake Manifold Cast #	Year	Displacement
1231381	70	350 2bbl
1231924	70	350 4bbl
1236402	71	350 2bbl
1236839	71	350 4bbl
1238578	72	350 2bbl*
1238586	72	350 4bbl
1238643	72-73	350 2bbl
1238647	72-73	350 4bbl
1242014	72-73	350 2bbl*
1242015	72-73	350 4bbl*
1245057	74	350 2bbl
1245058	74	350 4bbl
1246677	75	350 4bbl calif.
1249166	75	350 2bbl
1249168	75	350 4bbl
1382615	68	350 4bbl
1382616	68	350 2bbl
1386845	69	350 2bbl
1387069	69	350 4bbl

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

Intake Manifold Cast #	Year	Displacement
1358504	64	300 2bbl
1359122	64	300 4bbl
1366695	65	300 4bbl
1367299	65	300 4bbl
1377507	65-66	300 2bbl
1378707	67	340 2bbl
1379948	66-67	340 4bbl

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

Exhaust Manifold Cast #	Year	Displacement
1364178 right 1359689 left	64	300
1369310 right 1359689 left	65	300
1375910 right 1375917 left	66-67	340