Diamond Power Pistons w/Pins works with JEEP GRAND CHEROKEE 4.0L OHV 2 Year Warranty (This product must be installed by a certified professional mechanic) Same day shipping when purchased before 3pm EST Our products are tested and meet or exceed OEM performance requirements Fits 87-95 JEEP GRAND CHEROKEE 4.0L 242CID OHV 12V L6 Pistons made with the best quality materials (Electrolytic Aluminum, Cast Aluminum, Tin and Polish)