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Buick Super 1956 engine issue


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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.

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