HEMI Technical Info

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Modern Hemi - Third Generation
5.7 liter Hemi (which was the third generation Hemi) produced roughly (it varies by car/truck) 345 horsepower (5,600 rpm) and 375 lb-ft of torque (4,400 rpm) from 5.7 liters (345 cid*) when used in the Dodge Ram - one horsepower per cubic inch.
 
Fourth Generation
5.7 liter Hemi (the fourth generation Hemi) produces up to 390 horsepower and 407 lb-ft of torque in the 2009 Dodge Ram 1500, using variable cam timing; it shuts off four cylinders when possible to get good mileage. The same engine produces 375 horsepower in the 2009 Dodge Challenger R/T. (This is the fourth generation Hemi if one counts all the original “small” Hemi V8s as the first generation, the 426 Hemi as the second generation, and the original 5.7/6.1 Hemi as the third; but it is the second generation 5.7.)
6.1 liter The Hemi is also available in a 6,059 cc (6.059 L; 369.7 cu in) version.[5] The engine's bore is 4.1 in (104 mm), and many other changes were made to allow it to produce 425 horsepower (317 kW) at 6200 rpm and 420 lb·ft (569 N·m) at 4800 rpm. The engine block is different from the 5.7, with revised coolant channels and oil jets to cool the pistons. A forged crankshaft, lighter pistons, and strengthened connecting rods add durability. A cast aluminum intake manifold is tuned for high-RPM power and does not include variable-length technology. Chrysler's Multi-Displacement System is not used on the 6.1.
6.4 liter Hemi (392 Hemi) is projected to be in the 2011 Dodge Charger SRT8 and 2011 Chrysler 300C SRT8. Numerous changes will be made from the 392 Hemi in the Challenger Drag Pack. Horsepower estimates range from 450 to 500 at this point;