[Eric68]

I stand by my original response.
What Dave427 is asking is whats engine temp is best for making the most horsepower.
I don't see anywhere in his question anything about engine longevity.
I agree, the hotter coolant temps will reduce cylinder wear.
saying that,
my engine in sig is in it's 6th year,
400 + passes,
20,000 miles,
160 stat it's whole life.
why 160, because this is where it ET the best.,,,leaving the starting line at 160-165F, crossing at 170-175F.
and believe me it's not worn out.

Exact same experience here with gasoline. High temperatures in newer engines are all about mileage and emissions.

With ethanol though, I have found that closer to 180* seems to provide best throttle response and best ETs.

 

[Eric68]

I don't run NASCAR, I drag race. Different type of racing -- different considerations for cooling. ie: heat soak.