The aluminium vs cast iron blocks is a nice myth. If you have every seen an aluminium block you would realize they are not the same molds. The cast iron block is so beefy, because that is how they designed them back in 1958.
Yes, now that you mention it, I believe you're right. That's just one of those things so easily parroted. I've seen lots of pictures of the aluminum blocks too so I should have known better.
