Quote Originally Posted by erik erikson
In this case the sim. is off more than 3%.

I screwed up. I entered the head flow but I didn't know there was a head category. What would a port-matched RPM Air Gap intake be considered? High flow or Max flow dual plane?

Anyways, I put in high flow dual plane intake, stock pocket ported canted valve heads with head flow entered, and all other specs and came up with 440HP at 5500RPM and 490TQ at 4000RPM. Not as satisfying but sounds more reasonable than 560HP.