Pushrod selection

The lifters can be run with a pretty wide range of plunger preload.

“Normal” style lifters would be fine with between .020-.080 preload.

So, if the current lifters are within that range, changing the pushrods isn’t likely going to cure anything.

Using a checking pushrod to compare the zero preload length vs the actual length of the PR, for all 16, will tell you where you’re at for preload.

If you’re well with the proper range, and you’re not running cam that’s known to be noisy........ then you’re likely going to be looking at replacing the lifters to try and reduce the noise.