I'm new to the y-block group, was a previous Ford FE guy. My 57 T-Bird, which is new to me as of Nov of 2013, is making a slight "knocking" noise (when hot) and it became noticeable after I discovered both rocker arm shafts were not quite lined up as the drain tubes on both sides were not present. I got two drain tubes and holders, aligned the shafts on both sides and now notice this knocking noise. Experience tells me now that I now have less oil pressure due to oil now flowing into and back out of shafts could my main bearings or connecting rod bearings be worn? Any thoughts?

1957 Thunderbird 312 Fordomatic