Wow! As always, I have gotten quite an education. Not being much of a mechanic, it's nice to get all these explanations in layman's terms, too. But anyway, in the end, whether I have a 440 or a 413, it was awful nice of the folks that engineered the car to give it waaaay plenty of uh..."stuff" to pass somebody if I felt the need, which I have on numerous occasions.:-) Yeehaw! Dave 67 haze green sedan Covington, Wa.