Have you changed your oil? Running low? Sometimes a fresh oilchange can clear up noisy HLA's.
Are you going to clean them or replace them?
If you do end up replacing them, there is an upgraded version with larger oil inlet ports so they dont clog and gum up as easy.
Either way count on re-timing the engine, the cams will have to be removed. Setting the engine to TDC before starting the project may make it easier.