Intake closing is determined by the intake lobe centerline and intake duration...
You can bump the intake centerline forward or backward and keep the same lobe center.... The exhaust centerline will follow if the lobe centers are kept constant/equal...
You can pick a lobe separation and then tune in when the intake closes by establishing the intake lobe centerline... You can have a lobe separation of 108° and bump the intake centerline as needed to close the intake valve wherever you want it to affect your cylinder pressure/dynamic compression....
It takes two parameters/degrees of freedom to lock in the intake valve closing and lobe centers....
