These are exact copies of the original 1969-70 valve covers that came on Super 428 Cobra Jet powered vehicles and the ‘69-’70 GT500 Shelby Mustangs and Mach 1’s. They were factory supplied on Super Cobra Jet engines and are on the accessory list above the plain finned Cobra Jet valve covers (the Ford part number in the Muscle parts catalog was C9ZZ-6582-B). They are perfect in every way, including the right die cast aluminum factory finish, just like the originals. Perfect for most all applications, as they have excellent valve train clearance and are low-profile enough so that you can still get to your spark plugs without master cylinder interference. Complete with internal baffles and spark plug loom brackets. They fit all 352-390-406-427-428 engines.