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a 12.7 head on a 14L

Discussion in 'Trucks [ Eighteen Wheelers ]' started by x#1, Feb 12, 2015.

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  1. Feb 12, 2015 #1
    x#1

    x#1 Road Train Member

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    who has ever heard of this and what is the benefit of and/or what is supposed to be the logic behind this conversion?

    just asking because i know of a truck with it done to it.

    thanks.
     
    x#1, Feb 12, 2015
    x#1, Feb 12, 2015
    #1
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  3. Feb 12, 2015 #2
    little cat 500

    little cat 500 Road Train Member

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    i dont see any reson for it would have to change more than just the head injectors ecm an prolly some sensors
     
    little cat 500, Feb 12, 2015
    little cat 500, Feb 12, 2015
    #2
    x#1 Thanks this.
  4. Feb 13, 2015 #3
    tommymonza

    tommymonza Road Train Member

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    is the Bore of a 12.7 and a 14 the same? So that the head gasket correctly mates to the head and block?

    Unless the 12.7 head has some better intake and exhaust porting or larger valves in it I don.t see where the advantage would be.
     
    tommymonza, Feb 13, 2015
    tommymonza, Feb 13, 2015
    #3
    x#1 Thanks this.
  5. Feb 13, 2015 #4
    little cat 500

    little cat 500 Road Train Member

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    head will bolt on but there's nothing to gain by doing so
     
    little cat 500, Feb 13, 2015
    little cat 500, Feb 13, 2015
    #4
    x#1 Thanks this.
  7. Feb 13, 2015 #5
    icsheeple

    icsheeple Trailing the Herd

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    Don't know. I just know all the cool kids are doing it.
     
    icsheeple, Feb 13, 2015
    icsheeple, Feb 13, 2015
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    x#1 Thanks this.
  8. Feb 13, 2015 #6
    magoo68

    magoo68 Road Train Member

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    Pretty sure just the strokes different .. Bore is the same .. We have one guy here with a hot rodded 12.7 pete he's running 14 litre injectors with pp box and other upgrades from pdi it's pretty awesome seeing a guy lay rubber with a partially loaded trailer when he grouchy one day lol .. Is it possible that by running the 12.7 head they are losing the problem parts
     
    magoo68, Feb 13, 2015
    magoo68, Feb 13, 2015
    #6
    bigguns and x#1 Thank this.
  9. Feb 13, 2015 #7
    Pablo-UA

    Pablo-UA Road Train Member

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    onese we got 14 L w\o head and we had 12.7 with broken rod and damaged block

    we fit 12.7 head, injectors, wiring, sensors and ecm on 14L head.

    Engine keep running well, with a bit better perfomans than 12.7.
     
    Pablo-UA, Feb 13, 2015
    Pablo-UA, Feb 13, 2015
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    x#1 Thanks this.
  10. Feb 13, 2015 #8
    x#1

    x#1 Road Train Member

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    yep it is on my truck that is getting a slowww in frame. whew. but anyway, had we gone with a 14L head,as opposed to the 12.7 on there,the injectors would have to be changed,injector wires,etc.the new/rebuilt detroit 12.7 head to be in monday. poor baby had not been maintained well at all up to this point but all should be well soon.everything is cleaning up well and looking bright and shiny and smooth.considering the shape it was in, it sure did run good. i can only imagine afterward.

    thanks for the replies forum friends.if anyone has more to contribute,please do so. i am all eyes since i can't hear on here.this has been an enlightening ordeal for lack of a better term. at least we'll now know what is there.
     
    x#1, Feb 13, 2015
    x#1, Feb 13, 2015
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    ROY1213 Thanks this.
  11. Feb 13, 2015 #9
    x#1

    x#1 Road Train Member

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    Dec 24, 2009
    Cherokee County, Alabama
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    hoping that it will something like that. many cheap fixes have been done to eliminate the high wear/heat deals. we shall soon know. i am excited considering the performance before all this work.
     
    x#1, Feb 13, 2015
    x#1, Feb 13, 2015
    #9
  12. Feb 14, 2015 #10
    allan5oh

    allan5oh Road Train Member

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    Are we talking the newer 14.0L on the older 12.7? Or the other way around?

    An older 14.0L is the same as an older 12.7L I'm pretty sure. Just like the newer 14.0L head is the same as a newer 12.7L head. The difference is mainly the injectors, N2 vs N3. There could also be compression ratio differences.
     
    allan5oh, Feb 14, 2015
    allan5oh, Feb 14, 2015
    #10
    ROY1213 Thanks this.
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