I just noticed a tiny, but huge typo, that makes my post almost seem gibberish with just one extra charecter...
Quote:
Originally Posted by unruhjonny
From what I recall reading, prior to the end of the 1970 model year, the casting number was either partially, or fully removed for the ‘915, or SR for earlier castings.
It seems as though after the end of the 1970 model year, the block casting number was left as-is, and the block was just finished as required.
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Fixed.
I would be incline to agree with John's post;
I have observed that regardless of casting number, the date code is generally present, and can be used as an indicator of when that block was made (eg: which block casting was being used at the time).