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Here is a youtube video of the engine running and horible noise that makes me cry. Engine Noise

Out of curiosity what is the oil pressure reading on your engine from cold to hot? Also check to make sure your rocker shafts are installed correctly. The oil holes in the shafts should be facing down into the rockers. If they are facing up you need to turn them over the other way. Are your rockers factory hydraulic type or adjustable? Can you give a breakdown of how the engine was built parts wise?