[DieselMinded]

I found it In functions_editor.php

// set the height of the editor based on the editor_height cookie if it exists
$editor_height = $vbulletin->input->clean_gpc('c', 'editor_height', TYPE_UINT);
$editor_height = ($editor_height > 100) ? $editor_height : 250;

Changed to

// set the height of the editor based on the editor_height cookie if it exists
$editor_height = $vbulletin->input->clean_gpc('c', 'editor_height', TYPE_UINT);
$editor_height = ($editor_height > 175) ? $editor_height : 325;