Why are 318's low HP and torque?

dibbons said
Well, the 273 two-barrel was rated at 180 horsepower with 45 cubic inches less. A hope the 318 was putting out more than a 273 or something is really wrong.

http://www.dippy.org/forum2/index.php?topic=242.0 http://www.hotrod.com/how-to/engine/mopp-0311-318-engine-buildup-and-dyno-test/ http://www.hotrod.com/how-to/engine/mopp-0312-318-long-block-bolt-ons/