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With the timing set and cover installed, Smeding mocks the oil pan onto the block without the gasket, then rotates the motor over by hand to check for any potential clearance issues. Eliminating the gasket in this step makes clearance problems more obvious, and therefore easier to detect. Maintaining 0.250 inch of clearance between the oil pump pickup and pan ensures proper oil flow. After the clearance checks out, Smeding lays down RTV on both sides of the gasket around the timing set, then bolts down the pan.