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An open deck, as the name suggests, is pretty much fully open between the cylinders and the engine block walls. Open deck designs have the coolant channel cast into the top of the deck. This design improves cooling and reduces hot spots in the cylinder but provides much less strength and rigidity in the top of the cylinder.

A closed deck, is basically the opposite of an open deck and it's nearly fully closed. I say nearly fully closed, because the deck surface is only drilled for the head fasteners, coolant passages, oil supply and oil drainback passages. The tops of the cylinders are integral with the deck. This configuration is found in pretty much all cast-iron blocks and in some high-performance aluminum blocks.

Semi open falls somewhere between an open deck and a closed deck design, and every semi-open design is different. For the most part, it's going to look like an open deck but with some bridging between the cylinders and the block walls. The area where it bridges is going to be different for every engine.

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