The Pontiac Screen Windage Tray sandwiches between the block and the pan. Made to be used with the 301-455 blocks and aftermarket pans that are deeper in the front than OEM. The half-screen, half-solid design offers excellent oil control and horsepower savings. This full-length tray wraps around the oil pump and provides windage control for the entire rotating assembly. NOTE: On engines that use a two piece dipstick tube, the tube will require modification to be used with our tray. The main cap bracket on the lower tube will need to be removed and the lower tube fitted and attached to the tray. For ease of installation, use our #22-310 Oil Pan Stud Kit.