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The key power point of any buildup has to be the cylinder heads. For our fat Rat, we chose a set of Edelbrock Victor Jr. CNC'd rectangle-port heads. With 320cc Chapman-ported intake ports, the Victor Jr. CNC'd heads are based on the Performer RPM casting. In addition, the casting has been rolled 1.5 degrees before machining to decrease the chamber size and unshroud the valves.