Well. for what it's worth, sprint cars have not always been powered by 410's, I've seen a many of them run with flatheads, and Crockett ran an awfully bad ass 6 cyl Ford flat head, and I sold Yeadon his first Chevy V8, a 265 cu in one at that, and they were fast, many of the old timers remember when there was no substitute for cubes, I know that was eons ago, but we were still fast, and put on good racing, you young pups just don't understand it! It's kinda hard to breath with your head up your butt! Bob