If you are using original lifters, make sure they go back to where they originally were to prevent possible engine damage. Use a light brush of clean engine oil on each
Camshaft tappet 1 before seating them into the cylinder head; keep repeating this for all tappets. With all the tappets in place, handle the next step: installing the camshafts. Whenever you use new tappets, adjust the valve lash following the procedure. The cylinder head cover should be the final part you put in place.