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According to a very vocal engineer on another large mopar site, to make an aluminum block as rigid as an iron one means it almost weighs the same when its all said and done. You need X amount of aluminum material to = iron strength, and it's apparently quite a bit.

For the cost and 100# savings, I can see why they've been avoiding it.



Actually, i was wrong. The Teksid 4.6 blocks weighs only 85lbs. They dont seem to have any issues with reliability? In fact, it might be one ov the most over-engineered parts to ever see an American car. They were cast in Italy by a company that makes blocks for Ferrari though... so perhaps its engineering and quality control Mopar lacks? They seriously look like a mini Keith Black...

You've got me curious now... for comparisons sake (to a 426 Hemi) how much does a Keith Black Hemi (water) block weigh? Seeing as they are clearly superior to iron Hemi blocks, according to your friend they'd have to be almost as heavy? I'm guessing they are not.