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A 1979-93 Mustang 5.0 or 351W engine block main girdle can increase engine block strength by 30-35%. Our fox body Mustang main girdles are constructed from chromoly steel for superior strength and include high quality fasteners. Many of these main girdles also allow fitment of a custom Mustang windage tray. Top racers know that using a 1979-93 Mustang windage tray to keep excess oil off of the rotating assembly is an easy way to increase power and promote better oiling. Ford gained so much power from a Canton Mustang windage tray that they changed their engine assembly line to include them on all 2000 Cobra R Mustangs. Our 1979-93 Mustang windage trays come with all the bolts and hardware needed for installation.