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

Are all 12v heads the same?

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Old Aug 29, 2010 | 10:49 AM
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jpfiero's Avatar
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Default Are all 12v heads the same?

Can I use a '93 cyl. head as a direct replacement for a '96 engine?

I've got a '96 cylinder head that I was going to use on a good '93 block, but when the '96 blew, the #6 piston hit the head hard enough to crack the piston. I have a good head from the '93 block but I want to make sure all the accessories from the '96 head will swap directly onto the '93 head.

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Old Aug 29, 2010 | 08:47 PM
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No they aren't all the same. Pretty sure you will have to bush your injectors.
 
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Old Aug 29, 2010 | 10:46 PM
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Do you know what the difference is?

By bush the injectors do you mean install bushings around the newer/smaller injectors, or that I will have to get new injectors and throw out the old ones?

From what I have read the early heads had 9mm injectors but they switched to 7mm injectors before '93 and have been 7mm ever since. I would like to find out exactly what the difference is (if any) before I attempt to use the '93 head.

Thanks.
 
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Old Aug 30, 2010 | 11:25 AM
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The first gen head wont work on a 2nd gen directly but like stated about I think the only difference is the injector size.
 
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Old Aug 30, 2010 | 11:55 AM
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91.5 and up 12v heads have 7mm injectors.
 
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Old Aug 30, 2010 | 09:30 PM
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Ok, so that means that this '93 head should work I guess I'll try one of the injectors and see if it will fit, one of the valves is bent in my '96 head and I will need to get it magnafluxed if I'm going to use it.
 
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Old Aug 31, 2010 | 07:02 PM
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Hey sorry for ur bad luck,,, how did you crack the #6 piston to much off what thanks...
 
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