THE EARLY DOHC IS ALLSO A NON INTERFERENCE ENG , INSTALL A NEW CHAIN TENSIONER AND YOU SHOULD BE GOOD TO GO, CLEAN ALL THE JUNK OUT OF THE HEAD , THAT IS AN OIL PRESSURE FED TENSIONER WITH A SPRING ALLSO, IF YOU ARE CAREFULL YOU CAN SNAKE THE OLD ONE OUT FROM UNDER THE CHAIN AND GET A NEW TENSIONER IN WITH OUT TAKING THE CAMS OUT , IT IS TIGHT AND TRICKEY BUT YOU CAN DO IT ,JUST TAKE YOUR TIME , WORD OF CAUTION BE VERY CAREFULL TIGHTING THE VLV CVR BOLTS BACK DOWN, THE CORNERS ARE VERY EASY TO SNAP OFF, JERRY