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Once the integrity of the cylinder is compromised, there is no more compression, and no firing of a fuel-air charge, so no cataclysmic fialure like in the movies.
I have quite a bit of experience on radial engines, and metal fatigue is a large factor in head separations. Face it folks, the metal in these engines are starting to get tired. Most of the R-2800's that I'm seeing are running on reduced power settings than what they were originally designed to operate at.
When the TSIO-360 was developed, TCM was using 100/130 octane gas, not 100LL. The anti knock value isn't there with the blue gas.
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