My 518 low deck motor with 440-1 CNC ported by MCH made 775 HP on Oregon pump gas with 10.8 to 1 compression and absolutely no quench to speak of.(at 4300 FT above sea level also, DTS dyno straight up no fudging
![](/ubbthreads/images/graemlins/tsk.gif)
) The pistons have a 22 CC dish because the motor originally had a set of ported 906 iron heads on it
![](/ubbthreads/images/graemlins/image_294343.gif)
I should replace the pistons to a set of reverse dome with some quench, I'm sure there is some power there
![](/ubbthreads/images/graemlins/1343795-scratchchin.gif)
It is way easir to turn up the squeeze HP than it is to start with to much compression
![](/ubbthreads/images/graemlins/1343795-scratchchin.gif)
Big motors(C.I.) make a lot of power without a bunch of compression
![](/ubbthreads/images/graemlins/Twocents.gif)
I'd shoot for 10.5 to 1 or lower
![](/ubbthreads/images/graemlins/1343795-scratchchin.gif)