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The weight difference between aluminum and iron is about 70 lbs. You can make that up in other areas. Another viable option would be an aluminum 5.3, like an L33. Lower mileage and cost than a 5.7 LS1.
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Not the motor, just the short block. It's not an odd thing to discuss here on this site. Only con to the steel block is the weight. Only con to the aluminum block is cost.





