Chev Tappet Oiling Modification
I closed off the relief on the rocker shaft oil return. I then ran an oil line, 3/16" dia, from the hole I drilled in the fitting between the rockers. I then fitted an oil line with 12 small holes drilled in it that collated with the rocker ends and secured it with brackets.
The oil now slowly drips over the rocker tip and valve stem tip. This extra oil also helps keep the top end clean by washing the contaminates into the sump.As there are no valve stem seals on the valves, a small amount of oil will enter the combustion chamber.