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5.9L 12V Performance Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps Related to Performance and Longevity

3k or 4k gsk kit w/ only basic mods?

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Old Feb 28, 2010 | 04:10 PM
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Default 3k or 4k gsk kit w/ only basic mods?
I've heard in order to run the 4k gsk you need headstuds and a better headgasket? Are there any performance gains to running the 4k over the 3k w/ just the basic mods that I plan to do in my signature?
 
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Old Feb 28, 2010 | 05:14 PM
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no you dont... to run 4k you need 60lb valve springs... i recommend the 4k over the 3k... alot more fun... but the 3k you dont need HD springs. the stock head gasket is fine with a 4k gsk.
 
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Old Feb 28, 2010 | 05:28 PM
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So it doesn't need head studs?
I'm not so keen on changing the valvesprings .

Is it still impossible to over rev the motor w/ the 4k kit like it is stock?
 
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Old Feb 28, 2010 | 05:29 PM
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no the head gasket is ok without studs. but i would recommed the 60lb springs if you do 4k
 
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Old Feb 28, 2010 | 05:32 PM
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Screw doing springs, I dont want to go about doing all that
 
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Old Feb 28, 2010 | 05:33 PM
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Its a good idea ..but i run the 4k's without springs. just be carefull. just because you have 4k's dont mean you have to use them.
 
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Old Feb 28, 2010 | 05:44 PM
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Originally Posted by TwinStackPete379
just because you have 4k's dont mean you have to use them.
Or, that it's even remotely possible to "use" them.
 
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Old Feb 28, 2010 | 05:47 PM
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I got 4k's and my truck never sees over 3 grand. but when i get bigger springs i already got em. thats all..
 
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Old Feb 28, 2010 | 09:06 PM
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Originally Posted by TwinStackPete379
Its a good idea ..but i run the 4k's without springs. just be carefull. just because you have 4k's dont mean you have to use them.
What happens if the truck were to hit 4k accidently? Where do these trucks stop making power w/ basic mods?

Originally Posted by NadirPoint
Or, that it's even remotely possible to "use" them.
What does that mean?
 
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Old Mar 1, 2010 | 05:58 AM
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with a stock head/ cam these motors stop makeing power arround 2500ish rpm
 
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