PISTONS: Flattop or Dish for stoker....

One other point of data that I have is that I have a friend with a 416. He used the diamond flattops (6.6 cc) at zero deck, a set of x heads, and a MP 292/509 cam. He has no problem running 93 octane even at 34 degrees of timing. I know the X heads have a larger chamber on them than the E heads (72-74 cc's vs. the Edelbrocks 65 cc's) but they are iron. Plus the MP cam is really right at 240's duration @ .050.