If you are talking about the product details that appear on the product info page, this snippet handles them in /includes/templates/your_template/templates/tpl_product_info_display.php:
PHP Code:
<!--bof Product details list -->
<?php if ( (($flag_show_product_info_model == 1 and $products_model != '') or ($flag_show_product_info_weight == 1 and $products_weight !=0) or ($flag_show_product_info_quantity == 1) or ($flag_show_product_info_manufacturer == 1 and !empty($manufacturers_name))) ) { ?>
<ul id="productDetailsList" class="floatingBox back">
<?php echo (($flag_show_product_info_model == 1 and $products_model !='') ? '<li>' . TEXT_PRODUCT_MODEL . $products_model . '</li>' : '') . "\n"; ?>
<?php echo (($flag_show_product_info_weight == 1 and $products_weight !=0) ? '<li>' . TEXT_PRODUCT_WEIGHT . $products_weight . TEXT_PRODUCT_WEIGHT_UNIT . '</li>' : '') . "\n"; ?>
<?php echo (($flag_show_product_info_quantity == 1) ? '<li>' . $products_quantity . TEXT_PRODUCT_QUANTITY . '</li>' : '') . "\n"; ?>
<?php echo (($flag_show_product_info_manufacturer == 1 and !empty($manufacturers_name)) ? '<li>' . TEXT_PRODUCT_MANUFACTURER . $manufacturers_name . '</li>' : '') . "\n"; ?>
</ul>
<br class="clearBoth" />
<?php
}
?>
<!--eof Product details list -->
You can place the block wherever you want the output in the page flow.
You should have an untouched copy of the file at /includes/templates/template_default/templates/tpl_product_info_display.php; if you originally edited the /template_default/ version, you should restore that and make a copy in your custom template override folder.