Re: 074 Head date codes
Chevrolet did not necesarily use the same font/numerical styles for casting dates on the same exact type part depending on the date the part was cast(boy was that a mouthful!!)...... for example these are 2 pics of original x-ram intake top plate casting dates which are only one day apart and still very different...
those heads on ebay are almost a year earlier than the others...
Not that that proves anything on the head dates...I'm no expert, but just showing real pics of real parts for comparison...
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