Remembering why I
dislike working on
AO Silver Member
Join Date: Sep 2001
As noted, most likely the exhaust valve clearances, which are adjustable easily. Inlets don't tend to go far enough out to make much noise assuming the car is looked after properly.
BUT....a problem I used to see a lot on the 12V engine was serious wear on the cams on the exhauut lobes, and the exhaust followers. My old 155 V6 was so bad that the followers had worn their bores in the head into oval shapes, both cams were knackered and all the followers were too. Inlets just fine though.
You won't know until you have a look inside though - take off the front cam cover and carefully inspect the cam and followers - if there's a problem, it'll be apparent and you'll have to decide how to proceed. If not, adjust away! If the frnot cam is OK, chances aer the rear one wil be to so it'll be owtrh the effort to remove the plenum etc so you can get at the rear bank.