one more, even easy.
the distributor rotor is bad and ticks , or used wrong one or put on wrong, not fully seated.
bad Dizzy cap. cracks. even caused by above line. (they collided)
even a bad distributor has bad set of bearing and makes noise.
if anything bolted to the engine is loose it sure can make noise, what I do is use 2x4 and push on things on the engine running to stop the noise
and for sure look for things lose and rattling,
do a full engine flush, if it's lifters.
we even to valve cover off lifter tests running , done for 94 years, and I bet youtube has a guy doing that, I have many times.
using plastic sheet, cut for VC shape and using (love to say this ) DUCT tape, to hold it all down and this catches flying oil.
in the old days we find 1 lifter is bad. remove it and soak it in Acetone even some can be dismantled and make 100% pure and clean then pre oiled and tired again. (we did that then because owners would balk at a new set x8 of HLA new in box and labor.)
the push rods have a oil path, inside them that feeds oil to the rod/rocker contact point and we make sure all rockers so signs of top end oil to those points
or it will make noise and then fail hard,(wear fast dry)
the engine block oil gallery feeds each actual HLA with full oil pressure (40psi is par) then then pump up and noise ends until they are gummed up or SHOT
Shot means worn to death EOL, end of life this. RIP it.
a rocker mounting bolt loose?
here is a guy doing this 94 year old act for his first time.
so what does one do now.
doing this fin act. (stethoscope proves rocker is noisy)
gee just look, gee #2 has no oiling, top end ( i randonly picked 1 to fail to give 1 example)
or see the #2 push rod going wild out of control, not found yet we then grab a hammer ,wood handles only best, and hold only the head
we push the wood handle hard to each rocker to make the sounds louder or stops ticking. or it shifts the tick from push end to valve end.
that is 16 tests on 8 rockers and 2 ends of each rocker. the noise is at valve stem or at the push rod or both.
total cost is 1 sheet of plastic to catch the mess. or old bed sheet, cut to fit and tape'd down.
All old mech know what to do on Push rod engines, most cars now have none (SOHC/DOHC) so find an old dog.
the HLA sure can be cleaned. and pre lubed and primed, and put back in using $15 extractor tool. etc.
our rockers do not adjust. but the video shows the push rods feeding fresh oil (push end to valve) to the valves clear as day
never run any Push rod engine with no oil flow seen here. vivid. (the valve stems must get oil okay)
or rocker bolts are 21ft/lbs set. not adjusted at all.
FSM page chapter 9 , page 23 < the books is free in the #1 stick this forum.