Also make sure to have the notches on the end of the rocker shafts down and to the front on the drivers side and down and to the rear on the Rt. (passenger) side of the engine. If they are not installed correctly oil will not be supplied to the top of the engine. Also the top of the engine is oiled alternately according to camshaft rotation with one side getting oil at a time depending of camshaft position to the oil feed to the head.