![]() We recognized that the power gains would be greater on a 6.1L or 6.4L, but we decided to run this test on the more common (and now affordable) 5.7L Hemi. When you add the right cam to a Hemi, you end up looking like a hero. Basically you have a motor that has everything BUT a performance cam. Why all the talk about head flow on a cam test? Since the Hemi motor already offered adequate displacement, compression and head flow, all it needed was more aggressive cam timing to show some serious gains. We’ve seen ported Hemi heads post flow numbers topping 370 cfm. The larger 6.1L (and 6.4L) heads flow even more, but the icing on the cake is that all heads will respond to porting. That is enough airflow to support over 525 hp on a modified (normally aspirated) Hemi application. In stock trim, the intake ports on the 5.7L heads top 260 cfm. Right from the factory, the Hemi motors (5.7L, 6.1L and 6.4L) were blessed with impressive cylinder heads. The head flow offered by the modern Hemi motors is important as it all but dictates how well the motor responds to other performance modifications, most notably cam timing. Many of the components including the accessory drive were removed prior to the cam test. ![]() ![]() We wish they were as cheap as LS motors, but this 06 5.7L Hemi take out set us back $1,700. ![]()
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