V8 Buick Nailhead Casting Numbers, 264, 322, 364, 401, 425

Block Cast #	Year	Displacement
1165165	53-56	322
1165752	54-55	264
1169334	56-59	322
1173201	59-61	364
1174372	59-60	364
1185404	61-66	401
1185484	59-66	401
1196546	61	401
1196547	61	364
1340146	63-66	425
1345404	59-66	401
1346046	61-66	401
1349046	62-66	401
1354713	64-66	425
1354714	64-66	401/425
1364704	63-66	425
1364705	64-66	401/425
1364705	63-66	425
1364707	63	425
1364714	59-66	401
*Chev truck

Head Cast #	Year	Displacement
1165549	53-56	264/322
1166349	53-56	264/322
1168930	56	322
1169349	56	322
1172889	57-61	364
1175109	56-59	322*
1185485	61-66	401/425
1190415	62-66	364/401/425
1196914	63-66	364/401/425
1343840	53-56	322
1374603	64-66	401/425
1376912	66	401/425
*Chev truck 401/425 heads are 123-125cc

INTAKE MANIFOLD
Cast #	Part #	Year	Displacement
36387	-		4bbl
343241	-	'63	401 4bbl
1343985	1162286	53	322 4bbl
-	1163206	54-55	322 4bbl
1165308	1165308	53-55	264, 322 2bbl
1165384	1165384	55	322 4bbl
-	1169189 man. trans.	55	322 2bbl
-		56	322
1170616	1170624=40	55-56	322 2bbl
1170617	1170625=50/60/70	55-56	322 4bbl
-	1175327=	59-61	364 2bbl
-	1175328=	57-61	364 4bbl
1173313		57-61	364 4bbl
1185976	-	'63	401 4bbl
-	1187708=46/47/4800	59-62	401 4bbl
-	1349425=	62	401 2bbl
-	1354966=	61	401 2bbl
-	1358983=	61-63	401 4bbl
-	1356950=	63	401 2bbl
1353240		-	-
1353241		63	401 4bbl
-	1355410=	63	401 4400 OMIT ON HP
-	1353531=	63	401 4400 HP 46-47-4800
1363782		62	4bbl
1355409	-	62-63	401
1357106		64	425 2x4bbl
-	1357106=	64	401-425 2x4bbl
1370316B	1370316=	65-66	425 2x4bbl
1372113	1375118=	66	401hp 425 4bbl Rochester
1363782	1375548=	64-66	401-425 4bbl
1375549		63	425

EXHAUST MANIFOLD
Cast #	Part #	Year	Displacement
-	1165212= right	54-55	264/322
-	1172392left	-	322
1167750	1175575 left	56	322
1167833	1175576= right	56 and series 70	322
1167833	1175581= left	56 DUAL series 70	322
-	1185463= left	57-58 DUAL	364
-	1185602= right	59-60	364, 401
1186505	1186503= left	59-60	364, 401
-	1186291= DUAL left	59-60	364, 401
1173844	1187336= right	57-58 RM, Limited	364
1345464	1345564= right	53	322
1345465	1345565= left	53-54	322
-	1347776= right on 62	61-62	364, 401
-	1193697= left	61-63 40-41-4300	364, 401
-	1196974= right	61 44-46-47-4800	364, 401
-	1345435right	-	322
1348347	1348477=left	62-64	401
-	1356754= right	63	V-8 40-41-4400
-	1356568= left	63	401
-	1359689= left	64	V-8 40-41-42-43-4400
-	1354178= right	64	V-8 40-41-42-43-4400
-	1355435right	-	322
-	1355465right	-	322
-	1351702= right	62	401
-	1356756 left	-	-
-	1361860right	-	401, 425
1366827	1367159= left	65-66	401, 425
-	1372319= left	65-66 GS	401
-	1377476= right	65-66 GS	401
1377482	1377480= right	64-66	401, 425
-	1396568= right	63	44-46-47-4800

322	8 3/8"
364	8 7/8"
401-425	9 1/8"

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.

Looking at an aftermarket nailhead manifold and wondering what it will fit? Try this, measure between the bolt holes...
contributed by Steve Berry, Airy Cat