Actually, the pct pistons are going to be out of the hole on a b16a block.

People forget a b16b block is a b18c block in spec and thus quite a bit taller than a b16a 1/2/3 block. You also have to take into account the pct/ctr pistons sit about a third of an inch higher on the pin. That extra compression height along with a larger dome volume adds up to 12:1 in a b16 block.

Lots of people have put the pct pistons in expecting reasonable compression and are surpised by what they end up with. A lot of the miscalculating over the years has to do with reliance on the c-speed compression calculator, which does not adjust the deck height number correctly when using pct pistons. It is presumed this is because they didn't factor in the added compression height of the pct's.

The ZealAutowerks - Honda Compression Calculator calculator does factor in everything correctly. Also, if you subtract the added compression height from the deck height box on the c-speed calulator, it works fine. (The extra compression height of the pcts to subtract is .0287)

Your setup with no decking of the block or head, with 82mm pct pistons shows a static compression of 12.16:1 on the zeal calculator. If you stick with your 81.25mm bore, it drops to 11.97:1 on the zeal calc. Remember, if you cut down the head or block, it will be higher in all cases.

This is something you need to know when driving in the heat of August in Florida and trying not to detonate. The compression is not too high for 93 octane provided you are tuned properly, but you will want to go with some performance cams and adjustable gears that will provide the lift and duration to bleed off a bit of the compression and give you a little more flexability in tuning. CTR cams would help, but remember, they are matched at the factory to an engine with 10.8:1 compression. You would do a lot better with something more aggressive.