Re: ZL-1 casting dates
The 052 block that I own has a casting date of 4 1 69. The number that is cast below it is "257". On the back of the block, on the machined boss at the top of the bellhousing flange the number "498" has been stamped in and the number "498" is stamped into all the main caps. It has never been decked and there was never anything stamped on the front pad. This block is standard bore and was only used approximately 2,000 to 3,000 street miles in it's entire life. It has been sitting for a very long time and is in almost NOS condition.
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