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The 8000 rpm tach was Z/28 only and entered production early February 1969. It was phased in; at the time some cars were built with the 6000/7000 rpm tach. A very few later production Z/28s had an 8000 rpm tach with a 6500 rpm red line.
Mechanical lifter big blocks used the 6000/7000 rpm tach.
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