The valves input and calculation in the engine simulator allows you to specify valve sizing and cam timing.
Enter intake valve diameters, exhaust valve diameters, intake valve opening point, intake valve closing point, intake lift at the cam, exhaust valve opening point, exhaust valve closing point, exhaust lift at the cam, and rocker arm ratio. The inputs are used in the engine simulator and also to calculate intake valve lift, exhaust valve lift, intake duration, exhaust duration, intake center, exhaust center, lobe center angle, lobe center point, and overlap, by both crankshaft and camshaft position.