* 5.2L V8: This was a common engine option.
* 5.9L V8: Also a fairly common choice.
There wasn't a standard "Magnum" engine; that was a trim level. To know the exact engine size of a specific 1998 Dodge Ram 1500 Magnum, you'd need to check the vehicle's documentation (like the owner's manual or vehicle identification number (VIN) information).