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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #1  
Old 08-19-2010, 10:13 PM
jusmisdit1 jusmisdit1 is offline
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Default 3rd gen vs 4th gen hemi

so whats the difference between a 345hp 3rd gen and a 390 hp 4th gen is it all in the programming or is there some difference in the heads/lower end ?
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Old 08-19-2010, 10:22 PM
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the noticable difference is the Intake manifold I dont think the internals are different becuase Its still a 5.7.but Im not sure could be better flowing heads also.
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Old 08-19-2010, 10:53 PM
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For 1, the heads are different. (Exhaust ports are different shaped.)

4th gen has active intake runners. I do not know if 3rd gen has that or not.

Others will have to chime in regarding futher differences.
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Old 08-21-2010, 11:52 AM
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Not sure of the actual mechanical interests, but I have owned a 3rd gen and now have a 4th gen and I do believe my 4th is faster acceleratuion wise and runs smoother.
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Old 08-21-2010, 12:09 PM
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The latest Hemi's also have VVT.
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Old 08-27-2010, 06:12 PM
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HEADS. The ports on the (what they call Eagle) are sized and shaped like 6.1 ports. I don't remember if the valves are the same size, but there's no EGR and a 6.1 intake is a straight bolt on, no adapter required. Coupled with the active intake manifold and VVT, that's what makes the 45 horse difference.
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Old 08-27-2010, 08:35 PM
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It's my understanding that the Eagle heads outflow the 6.1 heads and this is why they're being used on the 6.4 Hemi.
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Old 08-27-2010, 08:39 PM
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Variable Valve Timing and, I believe, a slightly more aggressive cam grind. I'd have to go measure one of each to be sure and haven't had that opportunity yet.
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Old 08-27-2010, 08:51 PM
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Lift is the same but overlap and duration are a bit more agressive.
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Old 08-27-2010, 08:59 PM
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aha...you have access to the specs, Mr. Remerson228 sir???
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