That is way too high temp to keep an engine together. Engines run more efficiently at 185-195* range. At 260 the oil thins out so bad it can't protect the bearings.
modern engines are designed to operate in the low 200 degree range.
Its an emissions thing
Agree. The fans in my '99 Vette (LS-1) aren't programmed to come on till 226 degrees, and that's on low with the AC on. They come on high at 236. Not that those temps are what you want to see on an RB designed 50+ years ago. Its just that modern synthetic oils and blends aren't effected by temperatures as much as fossil oils used to be.
