Discussion Starter · #1 ·
There is a 5th port on the left head/ exhaust manifold at the rear. What is this for? Where does it go? I just finished replacing valve seals, new lash adjusters and new injectors. Took it for a ride and found the back two bolts on the manifold were broken. In replacing the gasket, I noticed the extra hole. Thanks: JBIs it something to do with the exhaust feedback?