1. what is open/close deck and
2. what is sleeve
3. what is .63 A/R


1. Following is the pic of an open deck engine where you see a gap in between the cylinder and block. This casting method is cheaper and faster production for Honda and hence no turbocharging applications allowed with more the 5-6psi they use blockguards or sleeve to strengthen this part of the block and then they are called semi blocked decks.
Open Deck of B16

block Guard


Well Iam sure by now you know what is a closed deck where there is no gap in the block as in the following pic which is from a H22a block

Closed deck H22A


2. Sleeve is liner placed on the inside of the cylinder in order in this case to strengthen the engine block for higher pressures.


Sleeve


Air cooled sleeve


3. Area ratio (A/R). The exhaust and compressor housings on turbo chargers use a "scroll" design. For example, the exhaust housing's scroll is where the exhaust gasses enter the housing and are directed at the turbine. It's basically a smooth, tubular chamber that surrounds the turbine with a slot all the way around that acts as a nozzle to direct the exhaust gasses at the turbine. It's called a scroll because it slowly gets smaller in diameter as a goes around the turbine. This pressurizes the gasses, forcing them out of the slot/nozzle at a fast rate. In turbo-terms, the scroll is measured by the cross-sectional area of the scroll's "tube" and the distance from the center of the "tube" to the turbine shaft (R). The values by themselves are not meaningful to the user and for the most part, R does not change much for different housings, but by dividing R into A, you get the A/R ratio. So, the A/R ratio of the exhaust housing refers to the size and shape of the scroll that is cast into the housing. It basically determines how restrictive the housing will be, versus how quickly the turbine will spin up. A lower A/R ratio (smaller scroll area, A) results in a more restrictive housing. This restriction speeds up the exhaust gasses and increases the amount that the gasses will expand. It's the speed and expansion of the gasses that causes the turbine to spin. So with a low A/R ratio, the turbine will spin up quicker, but as engine output and rpms increase, the restriction of the housing begins to build up too much back pressure on the engine, which reduces performance. A good rule of thumb for when there is too much back pressure is when the pressure in the exhaust manifold is more the half of the pressure in the cylinder. So basically, a larger A/R ratio will improve your engine's top end, while losing some mid range power and increasing turbo lag. A smaller A/R ratio will help the bottom and mid-range, but may effect the top end.

I have good pic the book that explains a lot of these very easily and with pics but a friend has borrowed it and has not writtened yet.
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