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Valve Cover Rail

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8. Ideally, the two parts of the valve cover rail will be at the same height. A small amount of height mismatch is okay, but if it's too far out, you'll need to get some machining done. Ours was close, but it wasn't perfect. If the intake gaskets stick up here, they can be trimmed off with a knife. A dab of silicone at the rail's head/manifold juncture will help keep the oil inside where it belongs.