One (1) exhaust manifold for sale in this listing. Manifold brand is unknown, possibly Martin. Exhaust manifold for a draw through turbocharging system for small block Chevy V8 engines. T4 turbo flange: 2.75" x 3.25" bolt hole pattern; will likely require an on-center turbo housing.
2" round exhaust port pointing downward has 2.75" bolt hole center to center, 3 bolt pattern. Head bolt flanges are a substantial 1 thick. Manifold weighs 15 pounds 9 ounces.
Small block Chevy V8 engines: 350, 305, 400, 383, 355, 307, 283, 327, 267, 302, 406. Will not fit Chevy LS based engines. Second gen LT1 and LT4 engines could be made to use this manifold, with a significant amount of fabrication for the cold and hot side plumbing. Search online for "Martin", "Rayjay", "Accel TurboSonic", "Draw through turbo", etc. For more info on draw-through turbocharging small block Chevy engines.I'm happy to answer any questions.