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For a 20 HP twin Briggs & Stratton engine, the valve specifications typically include a valve clearance of around 0.005 to 0.007 inches for the intake and 0.007 to 0.009 inches for the exhaust valves when cold. The engine usually features a flathead or overhead valve design, with both intake and exhaust valves made from durable materials to withstand high temperatures. Specific dimensions and tolerances can vary by model, so it's essential to refer to the engine's service manual for precise specifications.

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