1998 Jeep 360 5.9L OHV V8. 1993-2003 Dodge 360 5.9L OHV V8 Magnum. 1998 Jeep Grand Cherokee. (8) RECTANGLE DISH-TOP PISTONS. Enginetech Pistons are manufactured from Cast and Hyper-Eutectic aluminum and then machined to produce a unique diamond finish, all to exacting skirt tolerances.