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Single plain J-code 6.2L intake?

Discussion in '1982-Present GM Diesel' started by afroman006, Sep 13, 2004.

  1. afroman006

    afroman006 1/2 ton status

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    All the J-code 6.2L intakes I've seen and sold off of CUCV's were all duel plain but I just bought a single plain intake off of e-bay. The seller said it came from a military hummer and is a j-code. Whats the deal? I know with gas engines single and dual plain intakes have different performance characteristics, I assume its the same with diesels? What kind of performance can I expect from this manifold? Thx
     
  2. AgDieseler

    AgDieseler Certified Scrap Producer Premium Member GMOTM Winner

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    There are three different single plane manifolds available.

    1) 1988-1992 6.2L single plane J - has a raised center section with a single CDR port on the passenger side. Stud orientation is 12 & 6.

    2) 1993-2000 6.5TD single plane F - has a raised center section with no CDR ports. Provision for 6 mounting bolts; no studs.

    3) 198?-199? 6.2L/6.5L NA single plane Hummer intake - has a flush center section with a single CDR port on the passenger side. Stud orientation is 3 & 9. ***This is what you probably have***

    All three are excellent, and you can expect better performance from your single plane than a dual plane. There's a big hole in the center with runners going out from it. I have one, and will probably work it into my future plans.

    Here's a pic of a Hummer intake:
    http://www.oliverdiesel.com/inventory/hummerintake.JPG
     
  3. afroman006

    afroman006 1/2 ton status

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    Ok cool. Mine doesnt have a center divider, just a big open hole like yours. BTW, what is CDR?
     
  4. zcarczar

    zcarczar 1/2 ton status

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    Its a Valve, CDR stands for crankcase depression regulation valve.
     
  5. AgDieseler

    AgDieseler Certified Scrap Producer Premium Member GMOTM Winner

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    It's the goldish "tuna can" located either just above the alternator on early 6.2L engines, or on the passenger side valve cover on later 6.2L and all 6.5L.
     
  6. Pookster

    Pookster 1/2 ton status

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    Doh. This is certainly gonna make putting on an air intake fun!
     

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