1989 EFI Engine Trouble

My dad bought a 1989 yota that has electronic fuel injection, and it seemed to pressurize the radiator after it ran for 20 seconds. It seemed to be a head gasket because theres flow from one cylinder to the other, but I also wonder if it could be a cracked block????

Well, what engine do you have ?

The 3.0 V6 has a big problem with blown HG's.

The 4 cyl also is known for HG problems, which left unattended leads to a cracked head.