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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. View Related Article
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