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Thanks for posting that. This is good information. There are other things that may be possible on these 41A blocks too (big maybe). Most information states that they started production sometime in late 1944 and this always made me wonder if the first ones had the 59 on the bell or not or used the older box & cores. The 59 series (239) production was allowed to start in what would be considered mid year production in 1945. The War Department had eased restrictions with the impending outcome of the war so that the auto manufacturers could get back in to their business and war contracts were being discontinued as surpluses mounted. The 221 blocks continued in production for quite some time after the war as replacement parts.