What is a rocker lug?

you are probably refering to a rocker arm. In a pushrod motor the rocker are opens the valves. A rod rides on the camshaft and as the lobes on it come around the rod pushes up on the rocker are which...

a rocker is a guy that plays music Rocker arms. A shallow U shaped piece that goes between the push rods and the valves in the engine In newer cars, one end of the rocker arm rides on the camshaft...

its something very cool and very nice

No, how would 8 lugs fit over 5?

People used to say in the old days that a horse that was not worth much or not too fast or too pretty that it is a LUG.