59 Series engine question
Hello all. I have 3 engines that are 59 series engines but the front of the block is like an earlier block. All 3 will pass the pencil test meaning they will hold a pencil at the front of the block. I have done some searching but I haven't found any info on them. Does anyone have any info on these. 1 has a C , 1 has a Y and 1 has nothing. Thanks for any help
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