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exhuast cam cap three bolts a knocking?

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Plagued with very loud knock from inside of the cam cover of the cylinder head following rebuild on broken gearbox basket case. Removed top cam chain guard that was not the knock cause, then cut off the entire decompression assembly and that was not the cause of the knock..........

On reassembly noticed the exhaust right front bolt had bits of helicoil on it and was stripped only leaving three bolts to hold the cam cover on. Question could the missing bolt cause the case to flex enough to make the knocking noise? 

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Used a slightly longer bolt which gave enough bite to run and discover that was not the cause. Notice inlet cam slightly retarded when exhaust at tdc so perhaps a valve is knocking piston or chain is so worn its banging some where..........  no noise turning over with starter motor and plug removed.

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