Blazer has 110k miles and intake manifold gasket had been replaced wilt basic felpro gasket.. Has anyone ever experienced a failed intake manifold gasket or cracked intake manifold leaking into cylinder 3. Head gasket was intact with no signs of stress or a leak. Intake port on manifold for 3 had coolant in it and exaust valve on #3 bent?

 

cracked head? Intake manifold not so likely.