I am having a loud tick from my intake head. I have adjusted intake and exhaust valve tappet to .006 and ..010, ( specs) twice. What else can I check in the intake head valve side? I had the head gasket replaced two years ago and it started shortly after. It used to idle like a sewing machine. On start up it sounds great, when it hits operating temperature it has a single, rythmetic, annoying, noticeable tick....sorry, posted in wrong section.