hi, this forum has been a great source for help and info and i thank all the folks who take the time to help greenhorns like me learn and continue the hobby.

i'm working on a 1951 panel that has a 1957 235.
i've had the engine rebuilt using a mild cam, dual zenith 228s, edlebrock intake and fenton headers.

after running great for 500 miles, i noticed a ticking sound that is easy to hear on start up but gets quiter after about 2 mins. im still able to hear it once the engine warms up and it never goes away.
my first thought was a exhaust leak so i brought it back to the muffler shop that built the dual exhaust....3 times. the noise is still there.

now, i'm new to this so i'm still learning. my thought was that it could be a valve/push rod adjustment but i have heard different stories as to wether the valves could be adjusted on this motor as it has hydraulic lifters.

the tick is clearley coming from the top of the engine. if they can be adjusted, what is the process.

thanks for any help that you experts can offer!