Matt, the valve notch is the part that will throw off the readings, if entered incorrectly, it will think you have a dome, rather than a dish, and give a big number. In your case it will read almost a full point higher.
I'm using the calculator on the Diamond Racing web site. I had the valve notch part right....not sure what I was looking at ....going over all these numbers, I guess my head was swimming. The stock steel shim headgaskets were .020....so going to a composition gasket at .040, I need to mill the heads .020 just to stay stock. Then, if my calculator is correct, if I took .040 off, that should put me right about 82CCs on the heads, which show 9.55:1. I do need to get the heads CC'd to lock everything in. I think that will work for getting him back and forth to school.
