It is really hard to beleave that there is so much flex and movement in a huge hunk of cast steel that cylinders so carefully bored and honed can become out of round, or that under the pressure of even moderate compression the wall can buldge and leak past the rings, but it does. When you stop to think of what is going on in an engine turnig 6,000 RPM it's amazing they stay together! Anyway a torque/deck plate makes a lot of sense.
