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Just got my first diesel yestersay (used) 04 2500 4x4. How can i tell if it is the cummins 600 or not. The manufacture date is Jan. 04
 

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Look on the driver's side of the valve cover. If it says ISB 325 it is a 600. If it says ISB 305 it is a 555.
 

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Congrats on the new truck. Either way you've got some stump pulverizing torque. But lets hope for the 600!
 

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Doesn't really matter... and might actually be better if it's the 305/555 as they get better mileage and when you BOMB, you end up with the same numbers.
 

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Congrats on the new truck.. I love my 600, but Im sure Id be just as happy with the 555...
Scott
 
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