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13 The airflow capability of an out-of-the-box LS7 cylinder head is hard to beat, even with aftermarket ported units. The fist-sized, straight-through ports lead to big, 2.200/1.610-in valves held at a 12-degree angle (versus the 15-deg angle of most other LS engines). The intake ports measure 270cc, and the as-cast combustion chambers are 70cc. View Related Article
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