I would respectfully say that these comments are based on heresay and not backed up by facts. There are a handfull of P5 headed engines in Comp and Super Stock making 3hp per cube or slightly over. A W8 is as good as any GM type wedge head, they might get them to nudge 2.8-2.9 hp/ci, but most are run in the Econo classes, so they won't make those numbers.