Visual Aid For Figuring Custom Pistons??

I'm assuming this is more for parts/combo choosing than specific manufacturer proprietary data. I don't know of anything that shows a spinning model... But there are calculators like the KB site (my personal favorite) and the Wallace racing site and the usual desktop dyno things that can help show trends... There's also Larry Meaux's PipeMax, and Engine Analyzer and Analyzer Pro software that you can purchase... But they won't give you pictures. You have to be able to understand their theory, the math, and interpret the data because all of them have a certain level of assumptions built into them depending on what they were designed to predict.