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heh, 20psi on aluminum - isn't going to break anything.
Just think about that for a second. The tensile & compressive strength of an aluminum alloy is way, way higher than 20psi (even accounting for a 10:1 compression ratio, it's not even close). It's not as high as steel - of course - but the idea that crankcase pressure is going to blow up the block is ridiculous.
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