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Horsepower advantage of Steel Heads Versus Aluminum.
https://www.jalopyjournal.com/forum/threads/horsepower-advantage-of-steel-heads-versus-aluminum.540950/#:~:text=If%20you%20keep%20the%20tuning%20the%20same%20between,heads%20than%20aluminum.%20But%20it%27s%20hard%20to%20say.
Horsepower advantage of Steel Heads Versus Aluminum.
https://www.jalopyjournal.com/forum/threads/horsepower-advantage-of-steel-heads-versus-aluminum.540950/
The difference is after the engine has built up heat is it takes longer for the heat to escape from iron. The head gets hotter and stays hot for a long ass time. Aluminum heads shed heat like shit through a goose so they don't get the heat 'creep' allowing you to bump the compression a bit more.
Aluminum vs. Steel Head Power - Team Chevelle
https://www.chevelles.com/threads/aluminum-vs-steel-head-power.302044/
I also have read that, all things being equal, it is NECESSARY to build aluminum headed engines to have .5 or 1.0 higher compression ratio than an equivalent steel headed engine in order to produce the same power. The better heat dissipation of the aluminum heads, including exhaust, is supposed to cause the difference.
aluminum vs steel heads - Car Forums and Automotive Chat
http://www.automotiveforums.com/t514276-aluminum_vs_steel_heads.html
Aluminum is 4 times better against heat soaking than Cast Iron head. As we all know cooler denser air makes more power. While sometimes Iron heads tend to have slightly higher flow rates aluminum heads tend to get smoother ports and are easier to port. As they are a softer metal. Most high performance machines get aluminum heads for a reason.
#7---Choosing Heads: Aluminum vs. Iron (Which Ones Do You …
https://www.hughesengines.com/TechArticles/7choosingheadsaluminumvsironwhichonesdoyouneed.php
Aluminum heads will not automatically create more power than iron heads unless they flow more air and are installed on a higher compression ratio engine. In cases where you have a decent port job on a set of iron heads it is possible to bolt on a set of out-of-the box aluminum heads and lose power. Aluminum is automatically lighter but not faster.
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