is this a turbo or N/A ?
i've driven with a bhg for thousands of miles . just kept checking everything every morning an avoided heavy traffic .
even toyota told me i didn't have bhg at one point , i think they only really check compression and if that looks ok they write off the bhg idea. generally it's not like water comes gushing out
see here how thin the distance is from cylinder to water
http://www.ddmcse.com/turbo/images/bhg.JPG
you'll see the blown area this gasket had a special bite in the gasket to prevent gasket movement and it really did bite down and leave a pattern on the head and block