For SBC Stainless Steel Chevelle Monte Carlo Mid Length Headers Camaro V8 1 5/8" Stainless steel 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 Works for automatic and most manual transmission cars. Designed for straight plug heads. 3" collector, reducers are 2 1/2"". Made with thick 3/8" flanges to resist warpage!