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The set of cylinder heads on top are the original factory cast iron heads, while the set on the bottom are the AFR heads disguised to look like the OE heads. The differences are so subtle it would be hard to tell them apart at first glance. The pair of cast iron heads weighs 94 lbs, while the pair of AFR heads weighs 59 lbs. Any time you take 35 lbs off the nose of a car it's a good thing.