Can you play Japanese games on an American Xbox 360 without a modchip or a converter disk (i.e. swap magic)?

I know the 360 is region locked but i also noticed both regions (N.A. and Japan) xbox 360 games are NTSC. But with other systems i own that use region locking.

var:http://slimmovie.com/can-you-play-japanese-games-on-an-american-xbox-360-without-a-modchip-or-a-converter-disk-i-e-swap-magic/