Both the SOHC and DOHC 4.6 engines have cross bolts on the mains, in addition to 2 main bolts per in the SOHC, and 4 main bolts per in the DOHC. If you add the cross bolts to the total, then the SOHC is a 4 bolt main, and the DOHC is a 6 bolt main. It just depends on who you ask. Those that I work with refer to them as 2 and 4 bolt mains, but technically, you are 100% correct!
Take care,
-Chris