Valley Tray to keep hot oil off the bottom of the intake. When using aluminum heads do not use the factory style "bathtub" gasket. However you will need something to keep the hot oil off the bottom of the intake. The valley tray will bolt directly into the B/B engines but the S/B engines may need 1/4-20 holes drilled and taped directly centered over the #2 and #4 cam bearings (must be drilled before the cam bearings are installed). This will also work great with our 179101, 279101, 179102 or 279102 intake gaskets especially designed for performance engines.