A couple of weeks ago I promised to post some technical information on hot bulbs for engines. Here is the link: <http://www.oldengine.org/members/holland/images/HotBulbInfo/Thumbnails.html> I split the many pages up info 3 seperate .pdf files. Even as such the files are large so be patient as each .pdf loads. Hope this is useful. Curt Holland Gastonia, NC