For SBC Black Coated Chevelle Monte Carlo Mid Length Headers Camaro V8 1 5/8" Black Coated exhaust headers Works best with straight plug heads New pair of small block Chevy black coated exhaust headers. These headers are designed for many A, G, and F bodies with small block V8 engines using the standard exhaust pattern - 283, 305, 327, 350, 400, etc. Made with 1 5/8" OD diameter heavy duty ceramic coated mandrel bent 18 gauge tubing. 3" collector, reducers are 2 1/2"