Moroso 23020 Moroso Chevrolet Small Block Louvered Windage TrayMoroso 23020 Moroso Chevrolet Small Block Louvered Windage Tray Louvered Windage Tray, SBC and 400 block, with either driver or passenger side dipstick Louvered design allows oil thrown from rotating assembly to drain into sump without splashing back Teflon coated for quick drainage Improved drainage reduces windage, increases power Mount with aftermarket stud kits or with stock extended main cap studs Fits Moroso Oil Pans, some trimming may be