12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

98 12 valve 3 or 4gsk with auto trans?

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Old 11-11-2014, 08:31 AM
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Well maybe if i tear it back apart im jus gonna put the little springs in also and just go ahead and put the heavier valve springs in.. or ill jus keep what i got and put the heavier valve springs in... like i said i put them back right to to where they were which was .46
 
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Old 11-11-2014, 08:41 AM
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But if i do decide to back them down should i back it off until i get to the last click before it goes under .40"?
 
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Old 11-12-2014, 11:25 AM
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Well tuning the pump is an odd thing...

When I put mine in and I could free rev to probably 4500 my tach doesn't go up that high. So
To get mine just to rev to 4k I had to back my screw out to .35. I had taken all the shims out too. I had installed industrial injection 4500 rpm springs and set it the screw back in to .45 so I could get back to 4500.

Until you got your springs your right foot will protect your engine.

Just be forwarned with the 4k in I managed to pull a 1/2 mile drift on the way to class today, since the truck has more usable rpms
 
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