I still don't believe it, with out running the unmodified heads on engine "A" then pulling the heads, making the cut, and then rerunning the same engine head combination, you are only assuming both engines are twins. The test doesn't count! Even the same engine on different days will produce different results, so comparing two engines doesn't cut it in my opinion. Maybe if they were Nascar built engines worth $75,000 each I would believe it! Joe
