Been driving my 94 K1500 for the last 40,000 miles of its life, currently has 314,000 miles on her. Ever since about a month or so ago she has been making a kind of wierd ticking/knock. Doesn't seem like most injector knocks or rod knocks I've heard. More of a random scattered knock, gets really sparatic at around 2000RPM goes away above that. Drives great, doesn't smoke, same power as always. Pulled my serp belt and remained. I'm thinking possibly converter bolts? Any suggestions help.

 

Never hurts to check converter bolt's.If you have over sized exhaust it could be vibrating against the inner finder.

 

Engine mounts sag over time and the downpipe could be making contact with teh frame.

An often overlooked item is the rans mount and when they fail lots of noises happen.