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The A&A cast-aluminum cross-ram is a masterpiece of American craftsmanship. A virtual replica of the original Max Wedge item but with smaller port openings, it weighs 38.1 pounds bare. Like the original, the 15-inch-long tapered runners feed cylinders on opposite sides of the engine. The tuned runner length takes advantage of the naturally occurring pressure waves within the intake tract as the valves open and close. Chrysler's Tom Hoover and his staff originally designed the runners to deliver the maximum punch of the pressure waves-which travel at the speed of sound-to the backs of the intake valves between 4,500 and 6,000 rpm. The result is volumetric efficiency in excess of 100 percent within this rpm window. Put in basic terms, it amounts to free supercharging. The machined aluminum plugs seal the exhaust-heat crossover passages found on regular (non-Max) wedge heads like our 452's.