These Southwest Speed long tube headers are a direct fit for 1965-1974 Chevy passenger cars with Big Block Chevy V-8 engines, and will work with both automatic & manual transmissions. The unique design of the collector location makes these headers a great choice for many GM passenger cars that include: 1965-1970 Bel Air, Biscayne, & Impala, 1967-1969 Camaro, and 1968-1974 Nova with Big Block Chevy Engines.