These new blocks seem like a good ideal to me. If you are shooting for 500 plus HP why gamble on a production block that will only probably be able to be bored (Rebuilt) once before tossed in the trash because the cylinder wall thickness is to thin.
Not only that it will save you money if the bottom end doesn't fly apart and bend rods, break your crank and crack your high dollar heads.
I might be interested in the aluminum block myself as I'm sure the weight savings in the rear of my car would help me go around the corners a little faster. But I sure like the longer stroke in the 9.5" blocks
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