Careful with Evans. I used it on the watercooled engine in my plane and it allowed my CHT's to go through the roof. They were sponsoring me at the time so I called them and they said "Oh yeah, it will do that with a smaller engine." Gee, thanks. It will protect an engine from boil-over when you are experiencing extremely high temps, but the point is to NOT have the extremely high temps. I traded it out for the 'Wetter and it's been smooth sailing (or flying) ever since. I get the impression Evans is more beneficial for something like a racing engine V8 or V6 application.