I OWN A 1997 FORD E350 V10 18FT BOX TRUCK LOUD TAPPIND SOUNDS FROM TOP OF MOTOR

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DIAG CHECK CAME BACK PO303 3RD CYC I GUESS, IT HAD BEEN RUNNING A LITTLE ROUGH LATLEY BUT WHEN I STARTED IT YESTERDAY MORNING LOUD TAPPING FROM TOP OF ENGINE, IT TOOK 5 OR 6 IGNITION BUMPS BEFORE ENGINE TURNING OVER, SOUNDS AS IF NO OIL IS PRESENT IN VALVES. THANKS Joe S.