no no its not that...^......like ive told you before man its HLA'S!!!!!! do some research its completely normal for a KL to be ticking from the valuve covers. Ive had 2 KLDE and 4 K8 motors and a KLZE a yes after 60,000 miles or so they all thick ......theres only one other thing in your engine bay that could be ticking and that would be your timing belt tensioner, which means its time for a new one. try seafoam it might do the trick but no promises. GL and remember the ticking is A-OKAY! dont worry......