Howdy Stang66200 and All:
IIRC there is a SBC piston that is close in size that is Hyperutectic, that could be adapted. Ask Jack.
As for CR, IMHO, you'll be happier keeping your ratio closer to 9:1, given the elevation at your locale. Here's my thought. As long as you're redoing the short block, use stock type cast piston, with a small, 6.5 cc dish, but deck your block to zero. There are several advantages to this plan; It comes out to a 9.4:1 CR, uses cheaper, easy to get pistons, decking the block gets the quench back to a better dimension- improving turbulence and combustion efficiency. All other things being equal, in a wedge-shaped combustion chamber engine, a dished piston will make more power that a Flat-topped piston. The dished piston is more knock resistant too. Finally, take the time to smooth and radius all edges and polish all surfaces in the combustion chamber. Polished surfaces will reflect heat and minimize compression creep due to carbon deposit build up. Carbon and crud has a harder time clinging to a smooth surface.
A cast piston is easily up to this level of performance. I would add ARP rod bolts as an inexpensive precaution.
I have not had experience with H2O injection, and given a choice, I'd rather not have to. Check with Mustang Geezer on that one.
Isn't the compression ratio calculator fun? I'd change the deck height dimension on a stock 200 block to .025", as a more typical number. If your block is not stock, then I hope your measured it, and use that number. That's true with all dimensions. Measure twice, write it down and be sure.
Adios, David
