In Drupal 4.7 you have to go to : administrator > settings > posts>> . The default teaser is 600. You can adjust it to 200 - 2000.

To make the teasers to zero length you will have to update your node.tpl.php file & add a "if" block ( if page == 0 ). Here is the example snippet of one of the node.tpl.php. Make sure you modify your theme's node.tpl.php


">
<?php print $picture ?>
<?php if ($page == 0): ?>
"><?php print $title ?>
<?php endif; ?>

<?php if ( $page <> 0): ?>"><?php print $title ?> <?php print $submitted ?> Category:<?php print $terms ?><?php print $content ?>
<?php if ($links && $page <> 0): ?>
» <?php print $links ?>
<?php endif; ?>
<?php endif; ?>