On ebay,there is an oil pump that is a billet,high VOLUME oil pump,and the screw in part you are talking about sticks out about 1 1/2 inches or so. a couple other high PRESSURE oil pumps like the one I have,the screw in thing is sticking out 1/4 inch or so.
Here is the link to the HIGH VOLUME...
http://cgi.ebay.com/ebaymotors/ws/eB...tem=1833774953
here is the link to my HIGH PRESSURE...
http://cgi.ebay.com/ebaymotors/ws/eB...tem=1834619036