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Howdy,
Check for a bent valve, broken valve spring, bent pushrod, or broken rocker arm. You will probably have to loosen the rocker and spin the pushrods one at a time until you find it. If you find a pushrod bent, inspect it's valve, spring, rocker, and lifter carefully.
I think you will find a bent valve sticking and then eventually freeing itself until it rotates around to the same point again. The valve guides wear oblong so a bent valve will jam in certain orientations. That is the only thing I can think of to explain an intermittent knock.
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Mr. Shannon DeWolfe -- I've taken to using mister because my name misleads folks on the WWW. I am a 53 year old fat man. ;-)
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