Quote Originally Posted by Ltdnismorace
a header gasket could cause ticking? are you kidding me? a header gasket or exhaust manifold gasket as it is more appropriately called may cause exhaust leak, but not ticking.

I pray to god you don't work on cars for a living. Yes header gasket wear/blowout will cause a ticking noise. Anyone who has worked on a Nissan 3.3 in the Frontier or Xterra would know all about that.