BIG AUTOPARTS 8 Pack DG508 Ignition Coil Pack Curved Boot Blaster Ignition Coil for Ford Lincoln Mercury Part Number DG508 DG457 DG472 DG491 F523 New ignition coils are 10-15% MORE ENERGY than OE coils for Better Throttle Response and Maximum Fuel Mileage. Why? Turns Ratio: 61:1 & Top Quality Cooper Wire -- imported from German Elektrisoal. Found cheaper coils from other stores? Well, price depends on quality. We only produce safe product Excellent Electric Insulating Property Internal Construction -- epoxy, imported from Huntsman, who produces world's leading epoxy. Excellent Protection and Shock Resistance Housing -- professional high voltage di-electric resistant resin Coil Wire Attachment: Female/Socket; Primary Resistance: 0.660 ohms; Secondary Resistance: 6.1K ohms; Maximum Voltage: 26,000v DG508 Coil Pack Engineered specifically for 2 valve engines. See exact compatible vehicles in the product description 6000+RPM Continuous Iginitioin;Born for Racing, OE Standard performance & durability TS16949 Certified Manufacturer