The article Jerry was talking about with the pushrod modification is on Pre68Dave’s blog:

http://chev235guy.blogspot.com/

View the desktop version of site and you should be able to find it.

If you can’t locate and adjust-out the noise….a couple other easy checks you could do before modifying pushrods or inspecting lifters.

1) Observe pushrods and see that they are all spinning roughly the same rate. A sharpie or paint mark on each one might help. If you find any that are not spinning or spinning at a much slower pace….good chance that pushrod slightly bent. That would make proper adjustment near impossible.

2) What is the condition of the rocker tips? I had to resurface mine because they were dimpled. You can unbolt the rocker shaft and take a look without too much fuss. Dimpled rocker tips make it tough/impossible to get a good adjustment.

Sound never translates well on video, but that strikes me as a one rocker/lifter making nearly all the noise rather than an entire valve train making noise.

1951 3100