Compression Ratio per Camshaft Size

LSA and intake closing point both factor into selecting a camshaft as well. Seeing high compression requirements is usually an indicator of a camshaft design with a late intake closing event (the farther past BDC the intake valve closes, the more pressure it lets escape from the cylinder) and a significant amount of overlap. The recommended RPM range is usually higher up the scale than designs that don't recommend as much compression.