My 1976 FJ40 has been smoking blue smoke since I bought a month or so ago. I'm replacing valve stem seals with a compression tool for the springs and pressurizing the spark plug holes to 80 psi. Once I figured out the process it was going pretty smoothly but when I got to plug 4, and a lesser extent #5, I have faint airflow from a port on the top of the head. I circled it below in yellow. Anyone know what this is and if I should be feeling air when pressurizing the spark plug hole? Any thoughts on if it is normal or a sign of another issue?
I remind myself that chasing these things are the fun part.
I remind myself that chasing these things are the fun part.