[Marshall V. Daut]

By the way, I am assuming a Model B head gasket was used because of the two holes drilled in the Brumfield head. These holes could only be used if a Model B head gasket were installed. If, however, the correct and recommended gasket had been used, those two unplugged holes would compromise that area and would contribute to a blowout. This is akin to the four "steam" holes (or aids in the casting process) in a Model B block needing to be plugged if a Model A head and gasket are installed. Leakage, seeping and eventual blowout are to be anticipated if those holes are not plugged if anything but a Model B cylinder head with matching holes is installed.
Marshall