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The lifter valley gets a lot of special treatment including drain-back screens to keep any metal trash out of the oil pan. Drains are also chamfered for smooth drainback. "You want the oil back in the pan as quickly as possible, especially if you are racing," Marvin said. GE Glyptal 1201 from The Eastwood Company is used to coat all interior surfaces. This speeds up the drainback and keeps any stray iron particles out of the oil.