Manifold Headers for Ford & Mercury Models (1960-1983) 2.4L 2.8L 3.3LHigh Flow Exhaust Headers for 1960 1983 Ford & Mercury Inline 6 Models Replaces the restrictive factory cast iron exhaust manifold to optimize exhaust scavenging, lower engine bay temperatures, and increase horsepower on classic Ford and Mercury Thriftpower inline six engines. The Stock Ford & Mercury Exhaust Restriction The factory cast iron exhaust manifolds on 1960 1983 Ford and Mercury inline six modelsincluding the early Bronco, Mustang, and