Possible.  But having those ancient plastic blue caps blow may have saved head gaskets sacrificially.  A lot of guys including myself have opted for the rugged welded Aluminum Pressure tank with stout pressure cap; but even those are designed to blow, I guess to prevent worse damage.  Those are typically rated at around 16 PSI or so.

    On Sunday, July 7, 2024 at 01:53:13 PM PDT, John Rodgers <jrodgers113@gmail.com> wrote:  
 
 When the pressure cap blows off the coolant tank and coolant is lost, sure
sign of blown gasket, Right? 2.1 L