The cast Year doesn't mean it's for the model year. In 1969 when they cast the '70' it was put in quite a few 1969 Firebirds because of the extended run of Firebirds.
Not sure what they mean, but I figured it might be for a change in the block.
1970 went to 5 bolt mounts for example, and 1975 late went to the 500557 blocks.
But I do know that the partial VIN would be for the model year. 79 Phoenix block was a 1976 model.
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