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      03-10-2020, 10:11 AM   #22
The HACK
Midlife Crises Racing Silent but Deadly Class
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Drives: 2006 MZ4C, 2021 Tesla Model 3
Join Date: Oct 2007
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C6 Z06 engine has a tendency to drop valves into the cylinder causing catastrophic failures. If you're going to get one, make sure the springs on the valves are/were replaced with aftermarket ones of the HIGHEST quality. I had a co-worker who dropped a valve in his Z06, GM replaced the first engine, then promptly within the same year dropped another valve in the replaced engine, and GM basically saying "the first one on us. Not so much on the 2nd" and he sold the car immediately after the $20K engine replacement.

Of course, this could have ALL been avoided if he replaced the valve springs ASAP after purchase.
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