Cam Specs

I was watching Graveyard Cars tonight and Mark gave the specs for the cam and the intake had more lift and duration than the exhaust, the cam was for a hemi. I've noticed this alot on the hemi's and some other engines too, these were naturally aspirated engines as well. I thought that the exhaust was to have more lift and duration unless it was a turbo charged. Please explain this
Port design and other things that can be limitations call for a compensating event...like more int valve lift.
This is where a flowbench can be helpful...with other obvious things