Buick Super 1956 engine issue

[Frank DuVal]

22 hours ago, Florian said:

- did the compression test, all cylinders around 130 PSI when engine is cold, except cylinder 7 which was zero

- endoscoped the cylinder and found a stuck open intake valve, which is bent and touches the piston (shiny mark on piston and valve)

- took of valve cover, rocker arm is not under tension when valve should be closed

The zero compression in #7 can explain the not idling. It is causing a vacuum leak therefore lean condition to the working cylinders.