C blocks mechanically too large in Z. There are 26 blocks.

1041  
1057  
1064  
1093  
1135  
1311  
1329  
1343  
1418  
1428  
1441  
1457  
1493  
1548  
1562  
1574  
1713  
1798  
1800  
1840  
1854  
1866  
1879  
1885  
1938  
1997