thinking bout getting a cool head as far as i know motor is stock but dragged raced my buddys banshee which is bored twenty over and we tied every time and that was my first time on a banshee so maybe thinking it has something done to it was at 90 psi when i bought it (which it sat for 1.5 years) now ive ran it have yet to re test it let me say the chart on noss says my osi should be around hundred at my elev. but im wondering which size domes i should get if the motor is stock not gonna open it till i get the head and domes dont wanna have to wait for more parts to be shipped so just looking for suggestions on dome sizes desert and sand is what i plan to be doing and i wanna fly