Mark:
I think the tunnel heat is normal, although I don't notice it my C6 as much as I did it my C5. This is fixed by the tunnel plate or other insulators as described above.
I love my 160 deg. stat and now find my cruising temps are 178-180 as opposed to 198-200 before. The temps at idle or in traffic will remain the same until the fan settings are adjusted. The engines are designed to run at the higher temps to help burn hydrocarbons from the gas to help with EPA compliance. I just feel the temps made possible by the 160 stat are better in FL where we have much hotter weather...just don't need the additional heat.
Ted
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