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I think often the comparison is between factory cast iron heads, and aftermarket aluminum heads, which is an unfair comparison. When you're talking equal heads, and the only difference is what they're cast from, there's not much advantage.
Aluminum saves weight, and dissipates heat quickly. But they also heat up quicker too. I run Edelbrock aluminum heads on my BBC, but only because I got them for way less than half price, and they were new/used.
 
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