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Old 01-09-2013, 05:35 AM
BuzzLOL BuzzLOL is offline
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.. According to the casting guy at that link, the tall tin/nickel markings under the timing cover were ~95% accurate up to 1972, when GM stopped caring what those markings stood for... and if their engines were slugs... The smaller 010 and 020 markings elsewhere on the block were just sand core identifiers...
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