i been looking around at some local junk yards i found two 5.0 ford explorers witch year is the ones they came with the gt40p some one told me there is two diff gt40 heads out there.....
http://sn95forums.com/index.php/topic,42205.0.html There are many more gt40/gt40p threads in here man, they will be able to answwer just about any question you can come up with. If the link doesn't work just copy and paste it.