Plus it weighs a ton, and, you would never get as good or tight of quench as compared to a flat top and a filled in chamber. You have to give it to DLI for coming up with that to bandaid the problem. Those pistons are kind of along the same line as the KB pistons for RB's that have the big kick up on the dome for use with the 906 heads that are to take up the dead space in the open chamber.