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#1
08-23-2016, 03:01 PM
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Re: 6K/8K Tach
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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Learning more and more about less and less... 
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#2
08-23-2016, 11:41 PM
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Re: 6K/8K Tach
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: William</div><div class="ubbcode-body">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. </div></div> Thanks for the correction William. It's curious though that both the February 69 and October 70 P&A Catalogs call up the same tach assembly number (6469383) for 'Sp. H/Per (302,396)' applications. So does this suggest that the same assembly number (6469383) was used for both the 6k/7k and 6k/8k tach heads, as there is no apparent change between the Feb 69 and Oct 70 catalog listings?
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Tim in NSW, Australia 1969 Van Nuys 04A Z/28 from Clippinger Chevrolet. Cortez Silver with dark blue interior. Ran at Lions Dragstrip and Pomona Raceway, with paint by Bob Kovacs of Fresno.
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