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We know you’re going to invest in a set of Arias HEMIsphercial cylinder heads for your big-block Chevy just because they look really cool. Yes, the awesome valve covers are absolute eye candy, but in case your better-half wants more convincing, you get much larger valves with hemispherical heads because the valves are placed on opposite sides of the combustion chamber. The conventional wedge-head design has the valves side by side, which restricts the air/fuel mixture in and out of the combustion chamber and being more efficient, the Chevy will make gobs more horsepower. OK, that won’t convince her, but they look really cool.