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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 67-70
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  
Block Cast # Year Displacement
1241748 62-80
350
1231447 71?
350
1233472 67-68
350
1237650 70-72
350
1382201 70-?
350
481990 70-72
350
25504744 72-80
350
 
Exhaust Manifold
     Cast #
Year Displacement
13381328 pass
1231359 driver
70
350
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
 
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
 

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.