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These Mopar Performance aluminum LA cylinder heads will reduce front-end vehicle weight and improve airflow through your engine, right out of the box. They are designed to fit all Mopar 318, 340, and 360 LA engines. Mopar Performance aluminum LA cylinder heads are assembled with 2.020 in. intake valves, 1.600 in. exhaust valves, high performance single valve springs, retainers, and valve locks. Mopar aluminum LA heads are the perfect choice for your performance engine buildup.