![]() The block could have been sitting in the back room and used for the new bolt pattern possibly. Not sure how correct that is, but it seems plausible. I've been told this could have happened as GM would cast the blocks in batches and would just rotate them around when they manufactured the vehicles. I will note that the J looks odd to me, as if it were a different font, so I don't know the full story on this, although K 30 3 makes sense for the 3835911 block. Here's what I got when I took a wire wheel to it. If it was a KBM everything would make sense.but J is for '52. Odd thing is it HAS to be from late '53 as that is when the bolt pattern changed. My block came from a truck as it's a JBM which is right for a truck. ![]() Interesting that my block was built at the end of '53. Although I should add, the Corvette engine would have a different cam, I'm not sure what is in mine so I don't believe this is the Corvette block. The block is a 3835911, which is the same as used in the Corvette from '53-'55 ('55 offered both 235 6 and 265 v8). The strange thing is the serial number on the flat behind the distributor turns out to be a '52, it's JBM 479689. My block is a '53, the casting date on the block is K 30 3 (however that is split-up), November 30, 1953. I think I understand what I have now, although the engine serial number doesn't make 100% sense, I'm told this could have happened in the factory.
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