What year F-800? Just an wild guess, but it sounds like maybe a Ford 370 CI V-8.
__________________
ANG Msgt (ret)
2007 F-250 Super Cab Short Bed 4x4 XLT Sport Package
5.4L 3.73 LS Tow Command and a Flamed Dashboard Devil Duck. Doing what the diesel and V-10 guys said couldn't be done.......and loving it.