cylinder head temps.

230-240 degrees seems kind of hot to me. Is that from idleing in traffic for long periods of time? The aluminum heads will help make your engine run cooler, because they dissipate the heat better than cast iron. But I'd work on getting your current motor combination to run a bit cooler before purchasing some expensive aluminum heads. Like you mentioned...you don't want to damage new alum. heads. I'd replace the stock clutch fan with an electric or flex fan. The flex fan I run moves a lot more air, and made a difference in motor temp. Some other things that will bring the engine temp down would be a plenum spacer. That goes between the upper & lower manifolds. A bigger, aftermarket radiator, preferably aluminum. And last but not least Redline Water Wetter, which you add to your antifreeze. All those things helped my motor run much cooler. I never used the Water Wetter on my current setup...but I have on past Mustangs I've owned. It does work.

[mudchucker]

the weird thing is that i put in a cooler t-stat and it didn't make any difference at all. I can tell exactly where it opens and closes and it sure isn't 180. It will idle and run at city speeds great all day long with no issues, but as soon as i hit a highway it heats right up. kind of backwards in my mind. i will try the tricks mentioned above-those were great thoughts. Any other opinions/. How much better does an aluminum radiator work than a stock 3 core does?

Originally Posted by mudchucker

the weird thing is that i put in a cooler t-stat and it didn't make any difference at all. I can tell exactly where it opens and closes and it sure isn't 180. It will idle and run at city speeds great all day long with no issues, but as soon as i hit a highway it heats right up. kind of backwards in my mind. i will try the tricks mentioned above-those were great thoughts. Any other opinions/. How much better does an aluminum radiator work than a stock 3 core does?

Wow...that does seem backward, heating up on the highway like that! Strange. Not exactly sure what you meant by "how much better"...but a larger, aluminum radiator works MUCH better than the thin stock unit. It helps everything run cooler. I saw a difference on my temp. guage for sure.