Quote:
Originally Posted by rotorwrench
The late parts book refers to them as the 41A and they were a replacement block for the 221 engines starting during the war and likely sometime in 1944 when the government started to allow more spares for civilian products. They have the 59 casting on the back just like the 59A but less bore. They are impossible to detect among the 59 series unless you mike out the bores.
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They come in various configurations. I have one that has the voided area under the valve ports (like pre-war) and passes the pencil test at the front of the block and has a 59 mark. I think Ford was in such a hurry to fill the demand to get worn out car running after the war that they quickly modified existing molds the produce some replacement blocks.