Valve in new engine not seating

This is on my Pantera project that I received in February. The engine is rebuilt, mostly assembled, the heads are installed, and it has not been fired. The intake valve in cylinder #1 is not seating. Perhaps there is some debris that is keeping it from sealing. The engine is out of the car. I am thinking of pulling the spring and spinning the valve with a drill in an effort to clear any debris that might be in the seat. All of the other intake valves are sealing. Any ideas and insight that you have about this is appreciated.

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9/30/247:37 AM

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