Our LS ignition coils are the top coils on the market today, featuring magnetic steel cores specially designed to deliver up to 15% more spark than OEM. They use a high resistant epoxy material for added resistance to shock and vibration at high RPM. This is a high-output replacement of the Delco D585 ignition coil. Fits many GM LS2, truck applications. Replaces Delco D585 type coil.