Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

6.2 c code and j code engine differences

Old Jun 11, 2012 | 11:28 AM
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Default 6.2 c code and j code engine differences

I didn't see this question asked any where else so here it goes.

Is the only difference between the c code and j code 6.2's the intake manifold and the presence of egr on the motor?
 
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Old Jun 11, 2012 | 06:18 PM
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They also run different valve sizes in the head, injectors, injection pumps, and injector lines.
 
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Old Jun 11, 2012 | 07:59 PM
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C code run coarse threaded injectors, J code runs fin threaded.
 
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Old Jun 13, 2012 | 07:46 AM
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So if one wanted to convert their c code motor to a j code it would be a head swap, intake, injectors and nessesary equipment.
 
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Old Jun 13, 2012 | 05:19 PM
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The only heads that run a coarse injector are 82 all heads after that are fine thread. You could swap the heads but if you have a complete running 6.2 I wouldn't worry about it for the power gain you would get.
 
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Old Jun 18, 2012 | 07:10 PM
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I was more curious than anything. I wasn't sure of the extent of the differences. Thanks all for your replies.
 
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