![]() ![]() The new engine was a hit with the public, and also made Ward’s “10 Best Engines” award list two years in a row. ![]() This was also Chrysler’s first engine with an electronic throttle. The new cylinder heads allowed the engine to produce power comparable to an overhead cam engine but at much less cost. Placing the spark plugs on opposite sides of the valves allowed improved combustion efficiency while reducing emissions. In addition to the hemispherical combustion chambers, the new engine featured a first for Chrysler: two spark plugs per cylinder with coil-over-plug ignition. of torque, making it a segment leader when it hit the street in 2003. The new 5.7L HEMI Magnum V8 was rated at 345 hp and 375 lb.-ft. Better yet, it also delivered 8-10% better fuel economy. lighter, produced 41% more horsepower and 12% more torque than the previous motor. ![]() ![]() The new 5.7L engine was quite an improvement over the older 5.9L V8 it replaced. Thus was born the 5.7L HEMI Magnum V8, which made its debut in 2003 in Dodge Ram 2500/3500 series trucks. They then adapted and updated the hemispherical combustion chamber design from their legendary 426 HEMI V8 to provide the kind of airflow and power capabilities that would make this new engine a real performer. They opted for a traditional pushrod valvetrain to reduce costs, and a 90-degree block that would not require any major changes in production tooling. ![]()
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