sewing machine

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    Tapping Under Valve Covers, Sewing Machine Noise?

    my 66 coupe, 351W has a tapping sound that we can't seem to cure? like said its like a fast sewing machine sound and to cure it we've redone the cam/lifters/roller tip rockers and adjusted the valves several times? it's a comp cam (hydraulic), trick flow roller rockers 1.6, alum heads, edelbrock...