I look in the old Chilton books and they say that the old v-8 engines are non adjustable valves, and to bottom out the rocker arm nuts. I try this and bend the push-rods. How do I adjust them correctly. Do I just start the nuts down a ways and crank the engine, and tighten them up until they stop tapping, and then tighten them up 1/2 a turn or what? I'm getting a little frustrated. Please help me on this.