Sound like valve tick but seams to be coming from vac pump
I have a tick noise that sounds like a loose valve lash .I checked all of them and they are okay. It is coming from the drivers side and by using a long screw driver to listen to the cover ,IP ,vac pump the noise is the loudest from the vac pump. Any one have this happen pump is still making 16in vac I do not know what it should be making though
89 Ford F350 CC4X4 5 spd repowered with 97 180 hp 100 fuel plate boost fooler set at 30lbs. Pwr stroke intercooler 31/2" exh running bio.