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Trying to decide between an Aluminum or Iron block for your next LS build? Let us help you do some heavy lifting and break down the exact weight difference of each.
Here's the numbers at a glance:
The Aluminum 5.7 L LS block came in around 109 lbs.
The Iron 5.3 LS block came in around 218 lbs.
The difference in material loss, as you can see, is almost negligible between the 5.3 vs 5.7 vs 6.0 bore sizes. It all comes down to casing material.