Kool, Kmot. Amazing what you can learn if you just pay attention. Back to the original thread, some of these old engines fascinate me. I know they are not as good as new engines, but some of them run quite well anyway. I would much prefer to have a 2007 Impala than a 1970 Impala, but still some of the cars from the mid fifties thru the mid seventies are intriguing just as these old RC engines can be.