I agree, but with a proper tune my trx 2.5 seems to peak at around 290 when running in grass, and usually runs 240ish under normal dirt and pavement driving, so a 20 degree drop doesn't drop you into the sub 200 (too cool for proper expansion) range. Although, that being said there is really nothing wrong with peaking at 290 as long as the high temps are due to climate and running conditions and not lack of internal lubrication. I think we are basically on the same page. Your just emphasizing the point that using a bigger head to cool an engine that is running hot due to a lean condition will only mask the problem and allow the p/s to clearance prematurely regardless of in-range temps. I guess the point is that you shouldn't use a larger head to try to fix an overheating problem, as doing so will only hide the problem and not actually correct it. If you buy an aftermarket head it is important to do so knowing that fact or else you will wonder why your engine is shot after 1 gallon even though you never saw it overheat. Personally the only reason I bought the head was because I stripped my stocker and the GH was the smallest aftermarket head they had at my LHS. The only reason I leave it on is because it looks a bit nicer and seems to stand up better to having the truck skid on it when I flip over occasionally compared to the stock head which tends to snap and chip when you mess up and end up riding on it. Like I said, I do still have an extra stock head that always goes on when I'm running in cold conditions. Running cold is just as bad if not worse than running hot because of running lean.