Edelbrock RPM 6089 Heads SBC | Hot Rod Forum
Edelbrock''s website shows #60889, but no #6089. There is a #5089 check that first digit. #60889 is Performer RPM head, 185 cc intake runner volume, 64 cc chamber, " valves,straight plugs. Sold as a bare casting, not a complete assembled head. #5089 is Edeldrock EStreet head, 185 cc runner, 64 cc chamber, "" valves, straight plugs.