Stopping the knock: Lower compression and ported heads...

The heads are coming home tomorrow. I got to look at them today. MAN I like the look of clean & polished aluminum! The man was finishing up the valve job and reassembly. He said that they came in at 83 ccs. Over the weekend I cleaned the tops of the pistons and rechecked the height below deck. I've listed a .017 number but this time every hole came in at .012. The .017 number was from 2004 when I first built the engine. I'm thinking that when I had the engine in for honing in 2011, maybe the guy resurfaced the decks. I'm going to ask tomorrow, but after 2 years, he may not remember unless it was standard practice for him.
I did some calculations. The .075 head gasket will give an even 10 to one compression ratio while the .086 will give 9.77.
I'll post some pictures of the heads tomorrow. Thanks.