Thanks for the info. I live in Belmont (just outside of London). I read an article in Car Craft magazine about ten years ago that claimed that up to 20% HP gain, when an electric fan was used (you don't have to drive the propeller). The fans are also closer to the rad, so I thought that it would cool better (???). I have a 326 engine, and I installed headers, and the engine compartment seems too hot.....I also installed a flexible dipstick, and it was 'rigid' when the engine was cold, then when I ran the engine, I thought that it was going to melt (like a cold spaghetti noodle, then like a boiled spaghetti noodle). I don't want to take my headers off, if possible; this engine (or tranny- 2 speed ST300), is too slow as is. I am thinking of putting a 400 engine with a Th350 tranny.