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I don't remember if old VWs use a chain or a gear to drive the camshaft. If it's a chain you may be able to use the original cam by using a smaller sprocket on the cam to match it's speed with the crankshaft and open the valves twice as often. I would consider a different way to supply oil pressure to the engine. The crank driven oil pump won't supply much pressure at low engine speeds when the engine starts to turn. The intake valve is designed to hold pressure on the cylinder not keep steam out. It might be ok if the valve spring pressure is greater than the steam pressure.
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