Ok looking at a 2003 4.6IS that is great shape, has 72k on it but it has a ticking sound when first started and it gets less noticeable as it warms up but it is still there.

Did the research and figure that it is either guides going bad or Vanos?

Any thoughts? I know that this could be a risky buy and poss. a very expensive fix as the 4.6 engines are not that really available.

H