Ultimately, the question has no good answer, since there's no application stated. This matters most.
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Absolutely True, I wanted to try and get some facts out of everyone before i started getting too many opinions. Now that I have some good solid numbers and facts I can weigh whether I really want an all aluminum block, how much HP is acceptable, if I want to use my current block and parts, total cost etc. These posts were exactly what I was hoping to see. Thanks to all