<?php 

    query_posts(array( 

        'post_type' => 'portfolio',

        'showposts' => 10 

    ) );  

 while (have_posts()){

        the_post(); ?>

        <h2><a href="<?php the_permalink() ?>"><?php the_title(); ?></a></h2>

        <p><?php echo get_the_excerpt(); ?></p>

<?php } ?>