Help diagnose a sound (video link)

[Showdown]

I had my car (1977S with 54k miles) at the mechanic this winter for a lot of small maintenance stuff. When I got it back in winter it went into the garage while I did other projects- I didn’t drive it but 100 miles when I started hearing this ticking, pfft noise. I towed the car back to the shop where they determined it needed a valve adjustment, never mind they had done a valve adjustment when they first had the car.

They checked for broken head studs and didn’t find any, they retorqued the exhaust bolts and re-replaced the valve cover gaskets after re-adjusting the valves. The final determination was that it’s a 43 year old car.

Is this a noise that I should be concerned about?

https://youtube.com/shorts/9dI4NKFdvzs?feature=share

https://youtube.com/shorts/zIGWpeFa9E0?feature=share

[proporsche]

well? sound like they do not know how to adjust the valves...The only other thing is..does do it on cold engine and stays the same when warm?
Possibly broken valve spring and they did not check for that

try different mechanic

Ivan

[Locker537]

It's something that changes rhythm with the RPM. That's a good enough data point that I would start with checking the valve clearances as Ivan says.

[snbush67]

Listen to the chain boxes, it’s not likely that any mechanic would have missed it but it could be a chain ramp crying for help.