Bigger cams and stage 2 or 3 heads will make that noise go away.

 

Play nice.

 

That is not the lifters. Is an air cooled Harley with even factory open exhaust that most of all that clatter noise comes from. If you want to here valve clatter. Drain the oil and remove the filter. Now turn the motor over a dozen times or so to drain the lifters.
Refill the oil and new filter. You will think it's coming apart for about 30 seconds. That's lifters.

Another way is listen to it run it at fast idle and cover the exhaust with a heavy rag and listen or put a two ear stethoscope in your ears and probe engine all around. You will realize most of the noise is in the exhaust pipes sound..

 

I am so glad that as a senior citizen with poor hearing even with a H-D I don't hear much. So I don't worry about sounds.

If the rod comes out the case or the valve drops into the piston then I know there something to fix. Those did happen in the 60's and 70's with my Hondas so I fixed them.

With all the noise the H-D's make I never had to fix a thing. Yet!

 

 

A few weeks ago I had a clacking noise that was caused by a loose primary chain.