I just put the Summit in my LT1 about 2 weeks ago. It definitely stabilizes the temp. It stays about 175-180 deg all the time. Not as much up and down. I also have my fans coming on early and except when the A/C is on they don't run anymore.

I also dropped my ET by a 1/10. Not much, except I went from 12.0 to 11.9.

What car are up putting it on?