Bad head or cracked block?

Asked by SappJB Apr 22, 2022 at 08:01 AM about the 1974 Ford F-100

Question type: Maintenance & Repair

1974 Ford F100 360.
When cylinder #1 firing, radiator becomes pressurized/ boils over.
Does not when disconnect #1 and run engine on 7 cylinders.
Head gasket or crack in block?

1 Answer
157,535

Bob answered 2 years ago

Head Gasket, cracked cylinder head or cracked block listed from what I think is most common to least common. You will have to take it apart to know for sure.

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