Ok.....with your dropping oil psi, you need to yank that thing open, at a minimum, NOW.
If there's more noise, that's an indication that the shoe material is GONE, and the chain is riding on the metal adjuster arms.
In many cases, this requires rebuilding of the entire engine, due to debris scattering and damage due to lost oil psi.......
I kid you not.
Cam surfaces will come apart and bearing rollers begin to delaminate/score due to metal and dibris in them. This can include the crank pin as well.....
“When the going gets weird, the weird turn professional....” ~ Hunter S. Thompson~
R.I.P. Rubberdown. 1971-2012
2005 E.G. Classic
Baisley Oil spring
Rinehart 3.5" pipes
S&S adj pushrods
3 stickers, adding 5 hp each. I swear......