Chevy Big Block Cylinder Heads Pcv Valves Port Heads
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Oval port heads (top, but you already knew that) don't offer a high air flow capacity as their rectangular port counterparts, but are actually better suited to most high-performance (as opposed to race) engines. GM Performance Parts now offers aluminum oval port heads with open chambers and 2.19/1.88-inch intake/exhaust valves. View Related Article
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