1958-88 Mopar Big Block 383-426-440 Fabricated Aluminum Wedge Valve Covers - Retro Finned Mopar big block fabricated polished aluminum retro-finned racing valve covers fit 1958-1988 Mopar 383-426-440 big block engines. They are made of very high grade billet 6061 T5 aluminum and polished to a near mirror finish. These valve covers will clear most popular rocker combinations. There is one breather hole in each valve cover. Height: 3-3/4".