Fits 1965-1978 Chrysler 383-440 Big Block;High quality 100% TIG welded construction; Constructed of 6061 T5 sheet aluminum; 1/4” thick 1-piece CNC billet flange for superior sealing; Your choice of silver anodized or black coated finishes; Applications for most popular GM, Ford, and Chrysler; 1.25" breather openings; Standard height or tall height available for additional valve train clearance; Includes mounting hardware; Sold as a pair;